PARAMENJA. 307 



from that of other forms by its two concentric circles of foliated 

 spicules (figs. 90). 



Banyuls, among Hydroids and Bryozoa. 



Paramenia impexa PRUVOT, Arch. Zool. Exper. et Gener. (2), ix, p. 

 724, 729, 786, pi. 30, f. 5; pi. 31, f. 64-73a, 82, 83. SIMROTH in 

 Bronn, p. 233, pi. 7, figs. 1-9. 



P. SIERRA Pruvot. PI. 48, figs. 8, 9, 10, 11. 



Body somewhat yellowish-white, 12 mill, long, truncated trans- 

 versely by the cloaca, which shows 28 roseate branchial folds ; back 

 with a many-lobed keel ; spicules needle-shaped or hooked ; cuticle- 

 rather thick, almost destitute of cutaneous papillae. Radula bi- 

 serial. 



Known by one adult individual. Easily distinguished from the 

 preceding by the very strong dorsal keel, which has about 20 some- 

 what irregular, laterally compressed lobes (fig. 8). The spicules 

 resemble those of P. impexa, some being acicular (fig. 10) others 

 hook-shaped (fig. 11), but they are larger. All around the pedal 

 fossa they are radiating (fig. 9). 



Off the Island of Pultelo, Spain, in 80 meters depth, on Aglao- 

 phenia, in company with Proneomenia aglaophenice. 



Paramenia aierra PRUVOT, Arch. Zool. Exper. et Gener. (2), ix,. 

 pp. 725-788, pi. 25, f. 6 ; pi. 30, f. 61-63, 83. SIMROTH in Bronn, p. 

 233, pi. 7, f. 10-14. 



"Solenopus " affinis Kor. & Dan. resembles this in the high dorsal 

 keel, but it is shorter, with the keel continuous. 



Subgenus PARARRHOPALIA Simroth, 1893. 



Pararrhopalia SIMR., t. c., p. 232. Proneomenia (in part) PRU- 

 VOT. 



Cuticle thick, with club-shaped papillae as in Rhopalomenia ; no- 

 gills. Excitation body large. Length five times the breadth. 



P. PRUVOTI Simroth. PI. 47, figs. 88, 89, 91-93. 



Body small, hardly 5 mill, long, generally compressed, bristling 

 with spicules, mostly of the needle-shaped form, but some are fish- 

 hook shaped. Supra-buccal sense tubercle small, with a tuft and a 

 basal palisade of lanceolate spicules, caudal tubercle terminal, with 

 many tactile bristles and a basal circle of lanceolate spicules. Penes 

 exsertile, two. Radula produced, biserial (figs. 91, 93). 



