NEOMENIA. 291 



tions I gather that Neomenla cariiiata resembles Chcetodervia in 

 habit. The latter lives in the soft bottoms, in which it rests with 

 posterior end up and anterior down, so that the mantle opening is 

 at the same level as the surface of the ground. Apparently Neo- 

 menla bores into the above described position by help of its protru- 

 sible proboscis, the only part of the body provided with a powerful 

 musculature. 



" In all the Neomemce which I examined, the intestine was almost 

 empty. In no case did it contain sand or mud, and identifiable parti- 

 cles were never found. The Neomenias feed, as does Chcetoderma, 

 not upon mud, but upon organic particles, which alone are taken 

 into the alimentary canal. It is impossible for Neomenla to find and 

 seize these particles separately by means of its large and unwieldy 

 proboscis, although it is extensible. The food is obtained by the 

 action of the cirri in the mouth, which remind one in a great meas- 

 ure of the cirri of the Scaphoj^oda, nlthough the corresponding organ 

 in Neomenia, in case that my animal has not been injured, is ap- 

 parently shorter in the extended condition. 



" Observations on habits have been made on Neomenla carinata 

 only. The other species are entirely unknown in this respect. Neo- 

 menia affinis and microsoleu are very similar to N. carinata, and 

 similarity in habits may, therefore, be inferred. Neomenla DalyeUi 

 may show greater variation in regard to habit, since it lacks the 

 penis and as it appears, the protrusible proboscis." 

 * Body keeled dor sally. 



N. CARINATA Tullberg. PI. 42, figs. 1-9. 



Length (in contracted state) 8-30 mill. Body curved into a half 

 moon shape when contracted, compressed above into a dorsal keel, 

 which is scarcely one-fifth the height of the body. Lightgray, with 

 a shade of rosy red around the anus. Spicules small, O'l mill, 

 long, simple and needle-like on the sides, but cliannelled and with 

 arrow-like points on the back, stomach folds 9, branchial folds 40- 

 45. Copulating organ present. 



West coast of Sweden, 60-200 Jms. ; Shetland Islands. 



Solenopus nitidulus M, Sars, Forh. i Videnskabs-Selskabet i 

 Christiania, 1868, p. 257 (name only, no description). — Koren & 

 Danielssen, Archiv for Mathem. og Naturvidenskab. Christiania, 

 1877, p. 6 (trans, in Ann. Mag. N. H. [5], iii, p. Z24).— Neomenia 

 carinata Tullberg, Neomenia, a new genus of Invertebrate Ani- 



