I would say ovovivparous as the young have egg sacks that the break upon exiting or outside of the mom. but here are defs for both.

Main Entry: ovo·vi·vip·a·rous
Pronunciation: -"vI-'vip-(&r&s
Function: adjective
: producing eggs that develop within the maternal body and hatch within or immediately after extrusion from the parent —compare LARVIPAROUS, OVIPAROUS, VIVIPAROUS

Here is the def for Viv

1 entry found for viviparous.
Main Entry: vi·vip·a·rous
Pronunciation: vI-'vip-(&r&s, v&-
Function: adjective
: producing living young instead of eggs from within the body in the manner of nearly all mammals, many reptiles, and a few fishes —compare LARVIPAROUS, OVIPAROUS, OVOVIVIPAROUS —vi·vip·a·rous·ly adverb

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• Boas, viviparous or ovoviviparous? - CBH, Wed Jan 25 20:19:32 2006
• RE: Boas, viviparous or ovoviviparous? - joeysgreen, Wed Jan 25 22:39:05 2006
• RE: Boas, viviparous or ovoviviparous? - bthacker, Wed Jan 25 23:00:06 2006
• Difference between ovoviviparous and viviparous...... - Kelly_Haller, Thu Jan 26 00:50:46 2006
• Thanks Kelly thats what I thought...np...... - CBH, Thu Jan 26 09:04:48 2006