1868.] DR.W. BAIRD ON THE GEPHYREA. 10/ 



This species, according to the only specimen we have in the Col- 

 lection, is upwards of five inches in length, and the trunk is about 

 one inch in circumference. It is of an olive colour, the exsertile part 

 of the body, or proboscis, darker than the rest of the animal. This 

 proboscis is large, somewhat club-shaped ; and the ribs, which run 

 down longitudinally, are placed at some distance from each other, 

 and, instead of being roughened with short spines (muricaled) as in 

 the other known species, are beset at nearly equal distances with 

 unequal-sized small tubercles, which have a lax spine coming out of 

 the centre. The lower extremity of the body is covered with rather 

 large warts. The tail itself is short ; but the papillae which surround 

 it are numerous, rather strong, and terminate in a long sharp point. 

 The teeth (which surround the mouth) are of a pale colour, of tolerable 

 size, spring from a broad base, and have only one (the central) spine, 

 slightly curved inwards. The lateral small teeth, seen in the other 

 species, in this one appear to be altogether wanting. The body is 

 divided into numerous flattened rings, about fifty in number ; the 

 grooves or sulci which separate them are very distinct ; and each ring 

 is marked with a fine groove running round the centre ; it is nearly 

 smooth at the upper part, becoming striated as it descends, and is 

 beset very sparingly with sharp spines, which, however, are most 

 numerous posteriorly. 



Genus 2. Halicryptus*. 



Halicryptus, Siebold, 1849?; Diesing, 1859; Keferstein, 1865; 

 Quatrefages, 1865. 



Halicryptus spinulosus. 



Uidicryptus spinulosus, Siebold, in Neue Preussische Provincial- 

 Blatter, vii. figs. 8, 9, 1849?; Diesing, Revis. der Rhyngod. in 

 I. c. p. 779, 1859; Keferstein, Beitr. in Nach. kon. Gesellsch. Gottin- 

 gen, p. 208, 1865; Quatrefages, l.c.ii. p. 599, 1865. 



Hab. ? 



Genus 3. ChjEToderma. 



ChcBtoderma, Loven, Hornschnch, Arch. Skandinav. 1845; 

 Diesing, Revis. d. Rhyngod. 1859; Keferstein, Beitr. in I. c. 

 1865. 



Chetoderma, Quatrefages, /. c. 1865. 



Ch^TODERMA NITIDX7LUM. 



Chcetoderma nitidulum, Loven, Hornschuch, Arch. Skandinav. 

 Beitr. z. Naturg. i. p. 69, tab., et in Froriep, Neue Notiz. torn, xxxiv. 

 p. 26, f. 43, 1845 ; Diesing, Revis. der Rhyng. in I. c. p. 770, 1859; 

 Keferstein, Beitr. in I. c. p. 208, 1865. 



Chetoderma nitidulutn, Quatrefages, I. c, ii. p. 602, 1865. 



Hab. Coast of Sweden {Loven). 



* Diesing, followed by Quatrefages, places this genus amongst his " genera 

 minus cognita;" but Keferstein accepts it as belonging to the inuiilj Pria^ulida. 



