L879.] NATURAL SCIENCES OF PHILADELPHIA. IT 



The oesophagus, the stomach, the biliary duets, and the intestine, 

 as in other species; the stomach on each side receiving a biliary 

 duct, and the posterior chief duct receiving from each side three 

 strong and one to two finer ducts; the length of the intestine was 

 about 9.0 mm., with fine longitudinal folds along the inside. The 

 liver papillae (in the dorsal papillae) rather nodose. The bursa 

 cnidojjhora in the largest papillae measured one-seventh to one- 

 eighth of the length of the papilla, containing a mass of cnidse, 

 elongate-pyriform or staff-shaped, reaching 0.026 mm. in length 

 (fig. 6). 



The heart and renal syrinx as usual. 



The hermaphroditic gland is large and yellowish, of the usual 

 structure ; in the centre of the zoospermic lobules were oogene 

 cells in peripheral nodosities. The anterior genital mass short 

 and clumsy, about 5 to 6.0 mm. long by 2.5 to 3.0 mm. broad, and 

 4 to 4.5 mm. high. The gl. mucosa and albwminifera white and 

 whitish. The vas deferens (fig. 5a) yellowish, very long, rolled 

 up in a tight coil on the fore end of the genital mass ; the penis 

 (retracted) short, bag-shaped, about 2 mm. long, nearly filled by 

 the conical glans (fig. 5), through the whole length of which the 

 continuation of the sperm duct could be traced. 



There was a peculiar aspect in the interior of this Aeolidia (as 

 well as in the Ae. serotina.) as far as observations on alcoholic 

 specimens go, which seemed to indicate a possible specific differ- 

 ence from the typical Ae. papUlosa, although the anatomical ex- 

 amination could not bring out any very reliable specific characters. 



II. CORYPHELLA, Gray. 



CorypJiella, Gray, Figures of Moll. Anim, iv. 1850, p. 109. Gray, Guide, i. 

 1857, p. 224. Alder and llanc. Monogr., Part VII. 1855, p. 49 ; Ap- 

 pendix, p. xxii. R. Bergh, Anat. Bidr. til Kundsk. orn Aeolid., 1. 

 c., 1804, p. 226. R. Bergh, Beitr. zur Kenntn. d. Aeolidiaden. iii., 

 1. c xxv. 1875, p. 633. 



Corpus elongatum, Rhinophoria simplicia. Podarium antice 

 angulatum vel angulis productis. 



Processus masticatorius mandibulse seriebus denticulorum prae- 

 ditus. Radula dentibus triseriatis ; dentes laterales margine 

 supero (interno) denticulati. Penis inermis. 



The genus contains Aeolidiidse. of an elongated form, with 

 simple rhinophoria and with the anterior margin of the foot 



