1880. J NATURAL SCIENCES OF PHILADELPHIA. 75 



The lobes of the hermaphroditic gland without developed sexual 

 elements. The anterior genital mass about 2.5-3.0 mm. in length by 

 a height of 2.0 mm. and a breadth of 1.0-1.5 mm. The ampulla of 

 the hermaphroditic duct of yellowish color, rather thick ( — 0.75 mm. 

 diameter), making a wide curve, about 2.5 mm. long. The spermato- 

 duct long ; its first part thinner, about 9.0 mm. long, then through a 

 stricture of the length of nearly 1 mm., passing into the thicker part, 

 which in its last half increases in thickness, and, all in all, has the 

 length of about 6.0 mm. by a diameter of 0.75 mm.; the last part 

 (fig. 12c) passes into the penis', in whose cavity (fig. 12bb) the glans 

 (fig. 12«) projects as a short club, the proper seminal duct passing 

 down to the gland in nearly continual cork-screw windings, and often 

 shining through the walls of the external coat. The spermatotheca 

 whitish, nearly spherical, of about 1.3 mm. diameter, filled with sem- 

 inal matter and detritus ; the spermatocysta elongate, nearly twice as 

 long as the former, yellowish, deeply imbedded in the mucous gland, 

 filled with ripe semen ; its duct somewhat longer than the cysta. The 

 vagina short.^ The mucous gland yellowish and yellow. 



The species approaches to the L. hystricina and L. varians (of 

 the Pacific), but differs entirely in its colors; still the possibility can- 

 not be denied that further investigations may show both the Pacific 

 " species " to be merely varieties of the old Lamellidoris muricata 

 of the Atlantic. 



ADALARIA, Bergb. 



Adalaria, R Bergh. Malacolog. Unters. (Semper, Philipp. II, ii). Heft 



XIV, 1878, p. xl. 

 Adalaria, R. Bergh. Gattungen nord. Doriden, 1. c. 1879, p. 360. 



Forma corporis fere ut in Lamellidoridibus. Notha^um papillula- 

 tum vel subgranulosum. Branchia (non retractilis) e foliis vix mul- 

 tis, in formam ferri equini ut plurimum dispositis formata. Caput ut 

 :n Lamellidoridibus, latum, semilunare, teutaculis vix uUis vel brevis- 

 simis lobiformibus. Aperturse rhinophoriales integral, tuberculis 

 anticis 2-3, calvitie postica. 



Discus labialis non armatus. Lingua rhachide lamellis depressis 

 instructa ; pleuris dente laterali interno hamiformi majore et serie 



' The exserted penis is figured by Meyer and Moebius (1. c. taf. fig. 4) 

 and mentioned as cylindrico-conical. 



- The upper end of the vagina seemed to present a particular diverticle. 



