and Species of Nudibruiwhiate MoUusca. 137 



t^oinewliat ,subj)risiiiatic, and in lia\ iiij^ the niaiitlf wvnw or 

 less pustulose, with its fore latrral and posterior border rather 

 thick and comparatively hut little expanded. //. /artra differs 

 from H. jH'Uitcidula in bearing distinct, large, soft, rugose 

 pustules upon the back, and in Iiaving the mantle-border 

 .'plj dissected and crenate. 



pusti 

 dee 1)1 



Hejcahranchus suezensls, sp. nov. PI. VI. figs. 3, 3 a. 



H. ellipticus, crassus, ad dorsum et subtus ad latera subpcHucidu- 

 lu3 ; pallio lato, phuio, murgiiie tonui inle}»ro sed raulto pHcato \ 

 teiitaculis dorsalibus parte sui)criore conifa laminata, reflexa, 

 ])rorsuiu conftMti.>(|ut' positis et in vaginas breves retractilibus ; 

 branehiis numorosis, parvis, muscosis, non-retract.ibl)US, in sex 

 cristis aiiuni baud propinque circuradatis ; teutaeidis labiali- 

 bus ma^nis, crassis, ovatis, margine multilobulato ; pede angusto, 

 BDtice ct postice rotundato, aatrorsum cum transversa fossa brevi. 



The general form is elliptic ; the body is rather fleshy and 

 somewhat seniitrans])arent on the back and, underneath, on 

 the sides. The mantle is smooth, with the expansion wide, 

 especially ])OSteriorly, and rather leathery in large specimens ; 

 its edge is thin and nearly smooth, and greatly folded or fim- 

 briated ; the origin of the lateral expansion is high in the 

 middle region, but lower towards the head and near the bran- 

 chiiv; in front the expansion is small, with the Ixtrder thicker 

 and more or less recurved. The dorsal tentacles are rather 

 slender, with the U}>pcr half conical, sharply bent back (the 

 angle being forwards and outwards), and having about seventy 

 diagonal and wavy lamina' proceeding from a slight, superior, 

 longitudinal depression. The lower laminaj do not extend 

 round the tentacle. The cavities into which the tentacles are 

 retractile are set far forwards and close together, and have 

 the margins produced into short smooth sheaths. The bran- 

 chiai are small, complex, and dendritic in a])pearance ; they 

 are placed in six non-retractile tufts at some distance around 

 the subcentral anal opening. Tlie oral tentacles are large, 

 fleshy, ovoid or leaflike, with a multilobulate border. The foot 

 is narrow, rounded, and transversely grooved in front, rather 

 acuminateil, rounded, and with a small portion free behind. 

 The mouth, large and exscrtible, leads into a cavity, the lateral 

 walls of which bear short, longitmlinally striated, subcorneous 

 jaws : the broad, heart-shaped odontophore is divided by a 

 median longitmlinal dej^ression, above which the lobes .are 

 applied together and bear about twenty-two transverse rows 

 of numerous, elongated, simple, recurved, pointed spines, none 

 of which are central in position. The general colour, in the 



