REPORT ON THE LAMELLIBRANCHIATA. 2()0 



recognised by a certain difference of form and other characters within the valves. It is 

 more trimcate at the anterior or broader end than any otlier species with which I am 

 acquainted. It is rather flatter than Solemya j^arkinsonii, Gray, from which it also 

 diifers in having a thickening along the front dorsal edge within the valves, which 

 extends as far as the anterior muscular scar, where it diverges obliquely somewhat from 

 the margin. Another distinguishing feature is the slender lu'a or raised line which 

 borders the anterior side of the hinder deep scar, and then runs obliquely upwards as far 

 as the middle of the front dorsal thickening. What portion of the ligament may have 

 been internal I am not able to state positively, as only a single specimen was obtained, 

 and that in a dead condition. A part of it may have rested in a slight transversely 

 striated depression, or shallow groove, along the dorsal edge, both in front of and behind 

 the beaks, but I do not think any portion of it was produced within at right angles to the 

 dorsal margin, as in Solemya parkinsonii and Solemya australis. 



Family A s t a R T i D ^. 



Subfamily AsTARTiN.a;. 

 Astarte, J. Sowerby. 



Astarte macandreivi, Smith (PI. XV. figs. 1-la). 



Astarte macandrewi, Smith, Journ. Conch., vol. iii. p. 228. 

 Habitat. — Tenerife, in 70 fathoms. 



This minute form was originally described from specimens collected by the late 

 Robert Macandrew at the Canary Islands, and the distinctions betw^een it and Astarte 

 triangularis are pointed out in the paper above referred to. 



Astarte magellanica, Smith. 



Astarte magellanica, Smith, Proc. Zool. See. Loud., 1881, p. -11, pi. v. fig. 7. 

 Astarte maijeUanka, Smith, Journ. Conch., vol. iii. p. 226. 



Habitat. — Prince Edward and Marion Islands, in 100 and 150 fathoms. 



The specimens from these localities are either finely concentrically ribbed or have the 

 ridges rather less distinct. In neither case are they so strong as in the single iy^a from 

 Boija Bay in the Strait of Magellan. Being smoother shells they more nearly resemble 

 as regards sculpture Asta7'te longirostra, d'Orbigny, from the Falkland Islands. They 

 difl"er, however, from that species in being less beaked at the umbones, and all have the 

 inner edge of the valves finely crenulated with the exception of one small specimen which 

 is evidently not full grown, a further proof (if any were needed) that the crenulation of 



(zool. chall. EXP. — PART xxxv. — 1885.) , Mm 27 



