228 A. K Verrill — Mollusca of the N'ew England Coast. 



ill 1467 fatlioms, two living and throe dead (No. 38,209) ; and station 

 209o, in 1451 latliorns, one dead (iS'o. 38,211). 



This species has been taken at uiuiierous localities off the European 

 coast hy tlie Valorous, Porcui)ine and other expeditions, and between 

 the Azores and Bermudas by the Challenger Expedition ; its range 

 being from 100 to 1*750 fathoms. 



It was also taken in the West Indies and Gulf of Mexico by the 

 Blake Exi^editious, in 100 to 1002 fathoms, according to Mr. Dall. 

 It is also found in the Pliocene of southern Italy, 



The specimens from the Blake Expedition, which I have examined, 

 are much more acutely pointed posteriorly, and have much stronger 

 concentric striations than our examples. It is quite possible that the 

 two forms are not identical. 



Yoldia regularis Yerriii, sp. nov. 



Shell small, nearly regularly oval, with both ends obtusely rounded, 

 and with the ventral edge broadly and regularly curved. The pos- 

 terior end is a little nairower and more tapered than the anterior. 

 The posterior dorsal margin is convex and rounded about as much as 

 the ventral edge. The anterior dorsal margin is distinctly concave 

 in front of the beak, but there is no defined lunule. The umbos are 

 somewhat prominent, of moderate size, and curved forward. The 

 beak is situated at about the anterior third. The surface is smooth, 

 polished and iridescent, without any sculpture except slight and 

 irregular lines of growth. Epidermis is thin and yellowish white. 

 The hinge-margiji is rather strong and curved, the posterior portion 

 much longer than the anterior, and bearing about eight rather large 

 and stout, prominent leeth. The anterior portion is short and nearly 

 straight, and bears ibiir or five prominent, erect teeth, the last tooth 

 situated onl-y a short distance from the beak. The cartilage-|)it is rel- 

 atively large and oblique and extends back a little ways from the 

 beak. 



Length, 3-5""" ; height, 2-5""". 



Station 1093, off Martha's Vineyard, in 349 fatlioms, 1882. Three 

 specimens (No. 38,420). 



This small species differs from all others recognized from our coast 

 in its very regular ovate form, w^ith the beak directed anteriorly, so 

 that it resembles externally a minute Tapes or Maetra, or a com- 

 pressed species of Calllsta. It is also remarkable for the shortness 

 of the anterior hinge-margin and tlje small number of anterior teeth, 

 as well as for the umisually large cartilage-pit. 



