162 AMPHIPORUS HASTATUS. 



ways, and are of different lengths. On the under surface of the snout the lateral furrow follows 

 a different course, being directed forward and inward on each side. 



This animal lives well in confinement; the sole specimen procured at Guernsey in the end of 

 July survived till the middle of November. At this time it discharged a vast number of ova and 

 perished in their midst, so that the effort of spawning had been too much for its health, or 

 the water had become vitiated by the fluids exuded during the process. When irritated it swam 

 rapidly through the water like A. pulcher, but generally lay quiescent on the bottom of the 

 vessel surrounded by a delicate mucous investment, the body being shortened and thickened, but 

 the head narrow and papilliform. 



It has strictly the structure of the Amphiporidce, the longitudinal bands of the reticulated 

 layer of the pinkish proboscis being very apparent. The blood is reddish-pink. 



The species was first described in a recognizable manner by M. de Quatrefages, and though 

 his drawing of the complete animal and its head are not quite accurate, their identity is satisfac- 

 torily made out. He does not say anything about the blood of this form, but he mentions that in 

 Cerebratulus crassus it is reddish, and this with other points at one time inclined me to unite the 

 species. The arrangement of the eyes is, at any rate, very similar, and if more pigment is added 

 to the dorsum of the present form, the distinction only rests on the author's account of the stylets, 

 on which comparatively little reliance can be placed. It was erroneously described as a new 

 species by the lamented Prof. Keferstein under the name Borlasia splendida, and as having the 

 mouth behind the ganglia ; but he correctly interpreted the structure of the stylet-region of the 

 proboscis. Prof. Grube accepted the anatomy given by M. de Quatrefages, and did not dissect 

 the animal himself. 



The Folia pusitta of Delle Chiaje (Descrip. e Notom., &c, torn, iii, p. 126, tav. 103, figs. 

 13 — 15) is a closely allied species. 



Amphiporus hastatus, n. s. Plate VIII, fig. 2. 



Specific character. — Snout not wider than the succeeding portion of the body, with a grooved 

 median ridge; ungulate when viewed laterally, hastate when seen from the dorsum. Eyes 

 somewhat indistinct. Brownish yellow, with white grains on the snout. 



Habitat. — In seven fathoms Bressay Sound, Shetland, amongst tangle-roots attached to 

 horse-mussels. 



Body about an inch and three fourths long, and a seventh of an inch broad, rather rounded, 

 gently dilating from the snout backwards, a slight diminution only occurring at the tail, which is 

 thick and broad. The edges of the body are not thinned off, as in A. pulcher and others. 



Colour pinkish ; very much resembling that variety of A. lactifloreus, the hue being deepest 

 in front, behind the reddish spots caused by the ganglia. The snout is paler than the subsequent 

 portion of the body, and shows a series of whitish grains on the upper surface. The proboscis 

 and proboscidian fluid are visible in the median line of the body. The mouth (woodcut, fig. 9) 

 has some grayish-brown pigment-grains along its margins, and there is a curved band of the 

 same hue a little behind the tip of the snout on each side. 



The under surface of the body is generally paler than the upper. 



