42 CLASSIFICATION. 



Lepidomeniidae Nstr. containing Dondersia must retain 8imroth's name 

 Dondersiidae. 



As has been noted by other authors the genus Proneomenia as created by 

 Hubrecht, has been much enlarged to include a number of species some of which 

 probably belong to other genera. Proneomenia weberi appears to be very closely 

 related to Dorymenia acuta and may in reality belong to Dorymenia. 



In the genus Strophomenia the long pharynx, the papillae and the numerous 

 seminal receptacles are so characteristic and similar in the species of the present 

 collection that I have no hesitancy in placing all in the same genus. Pruvot's 

 material was poorly preserved, as he states, and under such circumstances the 

 peculiar condition of the ventral salivary glands is readily explained as I know 

 from experience. The radula sac is likewise incorrectly placed, being much too 

 far forward. Evidently in Pruvot's species all traces of this organ have dis- 

 appeared. With this revision the species are quite similar. It is probable that 

 Rhopalomenia indica Nierstrasz belongs to this genus. 



Order Aplacophora v. Ihering. 



Suborder. I. ChaetodermatinaSimroth. 



Spiculose integument continuous all around the body. 

 Chaetodermatidae, p. 42. 

 Suborder II. Neomeniina Simroth. 



Spiculose integument interrupted beneath by a longitudinal 

 ventral furrow. 



Neomeniidae, p. 44. 

 Proneomeniidae, p. 45. 

 Piuvotiniidae, p. 47. 

 Dondersiidae, p. 48. 



. CHAETODERMATIDAE Simroth. 



Opening of mouth and anal chamber terminal. Body with more or less 

 sharply marked regions. Ventral furrow and fold lacking. Two highly devel- 

 oped plume-like gills. Radula distichous, polyserial or strongly reduced to a 

 large unpaired cuticular tooth. The mid-gut possesses, in most cases, a well- 

 developed digestive gland. Copulatory apparatus lacking. Coelomoducts 

 remain separate. Cuticle thin, spicules flat, often needle-form, but solid. 

 Inhabit .bottom ooze. 



