90 



JOHAN KIÆR. 



other. In one (fig. 1) the body is quite clear and transparem 

 and particularly soft; the body usually much flattened, an 

 the testa even, with the exception of the small processes. I 

 the other variety (fig. 47) the testa is a trine less soft, opaqnt 

 and dark yellow brown ; the surface has large and small proti 

 berances. The body, in general, less flattened. The arterie 

 in the testa, which, in the first variety, are without pigmen 

 are dark pigmented, and therefore still more visible. Betwee 

 these two varieties, there are now transitions with regard i 

 the form of the body, the colour of the testa &c. In or 

 specimen of the lattar variety, the small processes were almoi 

 lacking. 



A large, beautiful specimen of the l st variety (fig. : 

 has the folio wing dimensions: 



Inside measure (tåken out < 

 testa) 



Outside measure, length: 47 mm. Length: 38 mi 



height: 31,5 „ Height: 21 , 



„ breadth: 10,5 „ Intersiphonaldistance : 15,5 . 



A. specimen of the 2 nd variety had the followii 

 dimensions : 



Outside measure: length: 49mm. Inside measure: length: 43 mi 

 height: 29 „ „ heigth:23 



„ breadth: 19 „ Intersiphonal distance: 17 



The orifices upon short, but distinct siphons (this one 

 the inner body, the testa has no syphons), both 8-lipped, boi 

 but-especially the sewer siphon turned over upon the æ 

 mals rigth side. The mouth orifice, on the foremost part 

 the body, or not far from it ; sewer orifice about the midt 

 of the body, but nearer the fore end than the hind; in i 

 first of the measured specimens thus: 17 mm. from the fr 

 end, and 21 mm. from the hinde ; in the latter 20 and 23 m 



The muscles an open, irregular network on the right si( ; 

 it grasps slightly along the edges, and up by the mou 

 siphon, over on the lift side. In the former variaty ti 

 muscle is weaker than in the latter. 



