KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 50. N:0 5. 81 



Description of the New Forms. 

 Velutina insculpta n. sp. 



Pl. 2, Figs. 11—14, 16; Pl. .5, Fig. 29. 



Shell thin, calcareous, of a light reddish tint, covered with a thin wholly smooth 

 membraneoiis cuticula and' sculptured with fine imdulating impressed striae; whorls 

 rather coiivex; spire elevated with deep sutiire and a sub-central apex; aperture ovate, 

 not widened, with the outer lip rising lower than the spire and not expanded; columella 

 narrow, flattened with a longitudinal narrow groove, broadly sinuous. 



Animal of a dark purplish colour of the mantle, speckled with white; osphradium 

 lengthened, its length 3 — 4 times its breadth. Penis cylindrical, regularly curved, with 

 an abrupt end; tip of vas deferens minutely projecting. Maximal length of the shell 

 18 mm. Cfr pag. 11 and 59. 



Velutina insculpta n. sp. var. ampla n. var. 



Pl. 2, Fig. 12. 



Shell with a thin membraneous cuticula and fine impressed striae as in forma tj^pica; 

 whorls more expanded towards the aperture; the last-named is widened, its outer lip 

 broadly rounded but not expanded, and rising to about the height of the spire; colu- 

 mella narrow with an indistinct longitudinal groove. Length of the shell 10. c mm. Cfr 

 pag. 11 and 59. 



Onchidiopsis latissima n. sp. 



Pl. 2, Figs. 20—22; Pl. 5, Figs. 2, 4, 34. 



Body elongate-globulous, visceral mäss broadly attached to the foot and covered 

 with a rugose secondary mantle, forming around the foot a slightly prominent margin, 

 which contains the inspiratory and expiratory folds. Foot shield-like, broad in front, with 

 rounded or slightly prominent anterior corners, narrowing backwards, broadly rounded 

 behind; the posterior end only projecting a little, with broad borders and a small muscular 

 median part. Penis simple, cylindrical, S-formed, with a basal marginal crest but with 

 no dilatations. 



Primary mantle-border semicircular, absent posteriorly. Osphradium unicoloured. 



The median teeth of the radula with a quadrangular basal plate and an elongated 

 tapering median cusp. Inner uncini denticulated in the outer margin. 



Shell semi-oval, thin, of a papyraceous elastic consistency and a brownish or yellow- 

 ish hyaline colour, gradually becoming thinner backwards and terminating in a straight 

 line posteriorly but without defined börder; the posterior margin forming sharp angles 

 with the lateral margins of the shell. Maximal length of the animal 35, of the shell 24 

 mm. Cfr pag. 12 and 75. 



K. Sv. Vet Akad. Handl. Band 50. N:o 5. H 



