398 Prof. Grube on the Annelid Family Maldaniea. 



above-mentioned lateral furrows at tbe posterior extremity are 

 wanting, and a distinct posterior surface is developed upon it. 



As regards Maldane^ in which the terminal segment shows 

 so close a resemblance to the buccal segment of Glymene^ 

 Malmgren has refuted the author's erroneous conception, 

 according to which the former was the buccal segment, 

 and the uncini stood above the setas, and has established 

 the correct generic character. The terminal segment has its 

 apical surface inclined downwards and forwards, or nearly- 

 vertical and circular ; the anus is situated above this ; and the 

 preceding naked segment, which, like the setigerous seg- 

 ments, is biannulate, shows no indications of lateral or ventral 

 cushions. The vertical plate possesses a distinct margin, as 

 in Clymene ; and the setae are partly bordered, partly finely 

 denticulated. 



Of the three species belonging to the genus, M. hiceps ( Cly- 

 mene biceps J Sars) and Gl. Sarsiij Malmgr., are Scandinavian 

 and Arctic, and M. glebifex, Gr., from the Mediterranean. 



The genus PetaloproctuSj Quatref., established upon a single 

 species, is distinguished from Maldane partly by the want of 

 a vertical plate, and by its much abbreviated, hemispherically 

 inflated buccal segment, upon the anterior half of which, how- 

 ever, the median stripe representing the cephalic lobe is very 

 distinctly marked in the form of a keel, and partly by a pos- 

 teriorly inclined dorsal plate of the terminal segment including 

 the anus itself. 



This species is P. terricolaj Quatref., from St. Sebastian, 

 described as with 24 segments, of which 4 belong to the 

 anterior, 14 to the median, and 6 to the posterior region of the 

 body ; the last two, however, are not readily distinguishable, 

 as, according to Quatref ages, their segments bear setae and 

 uncini. The author believes he has met with the same animal 

 at St. Vaast, but counts in it only 22 setigerous segments : 

 the buccal and terminal segments are, as in all cases, destitute 

 of bristles ; and the latter does not appear to be preceded by 

 any non-setigerous segments. If there be no error in Quatre- 

 fage's statement of the number of setigerous segments, his 

 animal would possess in all 26 segments, as the buccal and 

 terminal segments in the Maldaniea are never furnished with 

 setae. Moreover it is to be remarked that, in the Petalo- 

 proctus from St. Vaast, the cushions for the uncini of the 

 seventeenth and five following segments extend even upon 

 the back, where they close like a ring, and that this dorsal 

 part of the segment is produced backward into a broad, thick 

 point. The caudal extremity of Clymene spathulata so ex- 

 actly corresponds with this description, that it probably 



