89 



along the coast from Alaska terminating at San Diego. The flow of the 

 California Current over this same region may influence this faunal distri- 

 bution, although it is difficult to see how certain species of Buccinid 

 gastropods could be distributed south by currents, as they have direct 

 development from egg capsules, even though shallow-water Buccinid 

 capsules often drift ashore. 



Only three species of invertebrates, the shrimp, Pandalopsis ampla, 

 the Galatheid shrimp, Munidopsis bairdii, and the kelp scallop, mentioned 

 previously, occurred in both the northern and southern borderland. None 

 of these species lives on or attached to bottom, so could be expected to 

 occur anywhere. A large number of holothurians, asteroids, ophiuroids, 

 sponges, polychaetes, sipunculids, anemones and pycnogonids were taken 

 at these stations, but many were ashed before identification in order to 

 test for radioactivity. The rest have not yet been identified by specialists. 

 The remaining specimens have been deposited in the Invertebrate Col- 

 lection at Scripps Institution. A complete list of the identified animals is 

 given below. A few of the mollusks are illustrated on Plate VIII, but 

 unfortunately the majority were ashed for remanent radioactivity studies. 



Gastropods 

 Margarites cf. beringensis 

 Gaza rathbuni 

 Solariella, sp. (dead) 

 Buccinum diplodetum 

 Ancistrolepis magnus 

 Chrysodomus liratus 

 Colus halidomus 

 Colas hypolispis 

 Colus trophius 3 

 Cryptogemma adrastia 

 Cryptogemma calypso 

 Antiplanes vinosa (dead) 

 Leucosyrinx erosina 

 Leucosyrinx persimilis 



Scaphopods 

 Dentalium cf. agassizi 

 Dentalium cf. rectius 

 Cadulus cf. tolmiei 



Malletia faba 2 



Chlamys I. monotimeris (dead) 2 

 Cyclopecten r. tillamookensis 2 

 Vesicomya stearnsi 2 

 Cuspidaria cf. beringensis 

 Dermatomva leonina 



Crustaceans 

 Pandalopsis ampla 3 

 Crago abyssorum 3 

 Callianassa goniopthalma 

 Munidopsis cf. bairdii 

 Munidopsis verrilli 

 Acanthalithodes hispidus 

 Chionoecetes tanneri 5 



Sipunculids 

 Phascalosoma, sp. (?) 



Lamellibranchs 

 Solemya cf. johnsoni 2 

 Nucula savatieri 



Crinoids 

 Afelecrinus, sp. (?) 



