AT THE LOYALTY ISLANDS AND NEW BRITAIN. 155 



IV. Genus. PHASCOLOSOMA, (F. S. Leuckart) Selenka and de Man. 



8. Phascolosoma pellucidum Keferstein. (IV.) 



One specimen found at Lifu, Loyalty Islands. This species has a very wide 

 distribution, being recorded in Selenka's Monograph from the West Indies, Rio de 

 Janeiro, the Philippines, Singapore, and Torres Straits. 



V. Genus. PHYSCOSOMA, Selenka. 



9. Physcosoma agassizii Keferstein. (III.) 



Four specimens from Lifu, Loyalty Islands. Keferstein 1 in a description of this 

 species dwells on the variability of the external features and appearance of this animal, 

 and figures three very different looking specimens of the species. The figure of the 

 Panama specimen closely resembles two of the four individuals collected by Dr Willey, 

 the other two from the Loyalty Islands had their introvert more retracted and more 

 closely resembled another specimen figured by Keferstein who does not mention its 

 place of origin. 



The species has been found at numerous places along the western coast of America 

 from Esquimault to Puntarenas. Fischer records it from Ambrizetta near the mouth 

 of the Congo, and from Ponape" one of the Carolines. 



10. Physcosoma asser Sel. and de Man. (VIII.) 



Numerous specimens from Sandal Bay, Lifu, Loyalty Bay, and one specimen from 

 New Britain. 



This is one of the few species of Physcosoma which has no hooks, but the skittle 

 shaped papillae on the short proboscis are capped by a thickened cuticular layer which 

 only wants bending over on one side to form a hook. 



In Selenka's Monograph it is described from Batjan, Sluiter found it at Billiton, and 

 Fischer records it from Mozambique. 



11. Physcosoma duplicigrdnulatum Sluiter. (XIII.) 



Four specimens from Blanche Bay, New Britain. 



The specimens corresponded fairly well with the species described by Sluiter from 

 the Malay Archipelago except as regards the number of rows of teeth ; but in this 

 point they differed very materially inter se. 



12. Physcosoma lacteum Sluiter (XIII.) 



Two specimens from Lifu, Loyalty Islands. The species was founded by Sluiter 

 on specimens collected in the Malay Archipelago. The specimens at my disposal agree 

 with his description, but the remarkably wrinkled and parchment-like nature of the 

 skin is not mentioned by him. 



1 Zeitschr. wiss. Zool., Bd. xvn., 1867, p. 44. 



22—2 



