390 A. E. Verrill — Marine Nemerteans of New Emjland, etc. 



ff. Anterior groups are more simple, distinctly separated from the posterior 



clusters, composed of one or two rows, and regularly curved. A. lacti- 



floreus. 

 ee. Posterior groups of few ocelli, which do not form close clusters. 

 g. Posterior groups consist of one, two, or rarely three, oblique pairs of 



ocelli on each side. 

 /(. Posterior pairs usually two on each side, convergent backward. A. 



ochraceus. 

 hh. Posterior pairs of ocelli divergent backward. A. glutinosus. 

 gg. Posterior groups linear, each of about four ocelli. A. griseus. 

 CC. Ocelli arranged in only two distinct clusters. 



a. Clusters transverse, -short, in front of ganglions. 



b. Clusters transverse, near fi'ont margin of head. A. frontalis. 



bb. A large angular cluster on each side of the middle of the head. A. 



mesosortis. 

 cm. Clusters of ocelli elongated, lateral, parallel with the margins of the 



head. 



c. Ocelli forming a simple row on each side of head. A. cruentatus. 

 CC. Ocelli in double or triple rows. 



d. Ocelli in two or three nearly parallel rows extending back of ganglions. 



A. virescens. 

 (id. Rows of ocelli broad, terminating at the ganglions. ^4. agilis. 

 BB. Ocelli two only, near the front of head. A. bioctdatus. 

 AA. Ocelli wanting or indistinct. A. emeus. 



Species not included in the above table : 



Amphiporus thallius. Ocelli doubtful ; only front groups observed. 

 Amphiporiis (?) superbus. Ocelli doubtful ; apparently two cerebral groups 

 only. 



Amphiporus angulatUS (Fabr.) Verrill. 



Fasciola anguhiia 0. Fabr., in 0. F. Miiller, Verm. Terrest. et Fluv., i. pp. 58, 1774. 



Planaria angulata 0. Fabr., in Mulier, Zool. Danic, Prod, p. 221, 177G. (Commuui- 

 cated by 0. Fabricius, t. Miiller). 



Planaria angulata 0. Fabr., Fauna Groenlandica, p. 323, 1780. 



Oinatoplea Stimj)sonii Girard. in Siimpson. Invert, of Grand MoBan, p. 28, pi. 2, 

 fig. 18, 1853. 



Amj)hiporus Stimpsoni Verrill, Notice of Hecent Addit. to Mar. Invert., Part I, 

 in Proc. National Mus , vol. ii, p. 184, 1879; Check List Marine Invert. Atlan- 

 tic Coast, p. 12, 1879; Bulletin U. S. Nat. Museum, No. 15, p. 143, 1879 (from 

 Cumberland Gulf). 



Amphiporus Fahricii Levinsen, Bidrag til Kundskab om Grceulands Turbellariefauua 

 p. 38, 1879, from Vidensk. Meddel. fra den naturli. Foren. i Kbliva., 1879-80, 

 p. 200. 



Plate xxxui, figures 1, la, 2. 



Body large and stout, only moderately elongated in extension ; 

 back convex, sides well rounded, lower surface flattened. The bodj- 

 is very changeable in form and can contract into a short, thick, 



