42 CLASSIFICATION. 



Lepidomeniidae Nstr. oontainiiiji Dondersia must retain Simroth's name 

 Dondersiidae. 



As has been noted by other authors the genus Proneomenia as ci'eated by 

 Hubrec'ht, has been much enlarged to inchide a number of species some of which 

 probably belong to other genera. Proneomenia loc'neri 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 anil the numeious 

 seminal recei)tacles 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 jioorly preserved, as he states, and untlcr 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. Chaetodermatina Siniroth. 



Spiculose integument continuous all aroinul the body. 

 Chaetodermatidae, p. 42. 

 Suborder II. Neomeniina Sinn'otli. 



Spiculnse integument interrui)ted licncath by a longitudinal 

 ventral furrow. 



Neomeniidae, p. 44. 

 Proneomeniidae, p. 45. 

 Piuvotiniidae, p. 47. 

 Dondersiidae, p. 48. 



CHAETODERMATIDAE Simuoth. 



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

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

 ojied plume-like gills. Radula tlistichous, 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. 



