Marichester Memoirs, Vol. xlvii. (1903), No. 5. 1 1 



collected a Pseudoceros of larger size (about 30 mm. in 

 length) entirely black, and evidently allied to specimens 

 from the Maldives referred by me to Ps. buskii (Coll.) 

 and Ps. flavumarginatus. Tt resembles still more closely 

 Lang's figure of Ps. velutimis, van violacea of Schmarda [2], 

 from the coasts of Ceylon. There is also a small specimen 

 of a black, yellow-margined species from Rotuma, and 

 others from Zanzibar are in Mr. Crossland's collection, 

 which I hope to describe shortly. I cannot feel certain of 

 the identity of these two specimens with any described 

 form, but, as these black Pseudoceros are evidently numerous 

 in tropical seas and possibly very variable, I cannot under- 

 take at present to name either of these specimens. This 

 group of black species is very difficult to examine owing 

 to the dense pigmentation. Probably Ps. diviidiatus [8] 

 belongs to the same group. 



Von Flehn [4] has found Ps. superbiis in the Pacific, 

 off the Galapagos Islands. 



There remain two species, one from Rotuma and one 

 from Torres Straits, the former represented by a single 

 imperfect specimen, the latter by two individuals too 

 immature to admit of a satisfactory diagnosis. Both 

 species have the typical folded pharynx of the Pseudo- 

 ceridae and are probably referable to the genus Pseudoceros, 

 but I believe that under the circumstances it is advisable 

 to leave them undescribed. There are, in addition to 

 these, one or two other species from the Torres Straits 

 which are unfortunately so macerated that no evidence as 

 to their position is obtainable. 



Literature Consulted. 

 I. QUATREFAGES, A. DE. " Memoires sur quelques plana- 

 rices marines." Ami. Sci. Nat, {Zool.) iv. (1845), 

 pp. 129— 184, pis. i—2>. 



