KEPORT ON THE LAMELLIBRANCHIATA. 101 



shortly wetlge-shapccl liehind, terminating in a short truncation. The surfiice is not highly 

 glossy, but has a silky, faintly iridescent, appearance. The sculpture consists of numerous 

 concentric thread-like lirse which become gradually thicker as the shell increases. They 

 do not all extend quite to the hinder margin, l>ut stop short at a slight fold radiating 

 from the beaks to the lower hindmost extremity. Some of them, however, do reach 

 the margin, and these are elevated into short lamellse, those on the right valve being a 

 little flexuous. The front dorsal slope is the slightest excui-ved, and descends only a little. 

 The posterior is shorter, very straight and very oblique. The lower outline is slightly 

 arcuate, and very feebly sinuated posteriorly. The interior is glossy, radiately substriated, 

 and exhibits a pale yellow stain towards the umbones. There are two cardinal teeth in 

 the right valve and one in the left, that in the latter, and the posterior in the former, 

 being somewhat cleft at the top. The lateral teeth are slender, elongate, the anterior 

 being rather nearer the beaks than the posterior. The pallial sinus is large and deep, 

 extending almost to the front muscular impression. 



Length 14 mm., height 8-|, diameter 3-J-. 



Habitat. — Station 167a, Queen Charlotte Sound, Cook Strait, New Zealand, in 10 

 fathoms ; mud. 



Tellina {Tellinella) huttoni, u. sp. (PL IV. figs. 2-2h). 



Testa tenuis, compressa, valde in8ec|uilateralis, oblonga, antice rotundata, postice 

 acuminata, nitida, concenti'ice tenuiter striata, dilute rosacea. Margo dorsi anticus 

 elongatus, vix declivis, pene rectilinearis, posticus brevior, obliquissimus, rectiusculus. 

 Margo ventris parum arcuatus, antice curvatim ascendens, postice baud sinuatus. 

 Umbones acuti, albi, in J longitudinis locati. Dentes cardinales duo in utraque valva, 

 postico valvse dextrse et antico sinistrse crassioribus, triangularibus. Dentes laterales 

 in valva dextra distincti, anteriori cardinalibus approximato, posteriori remote. Sinus 

 pallii profundissimus, fere ad cicatricem anteriorem productus. 



This species is very closely related to Tellina glahrella, Deshayes, also from New 

 Zealand, and indeed it is with some degree of hesitation that I venture to separate it. It 

 is a trifle more inequilateral, of a pinkish colour, has the anterior dorsal line longer and 

 less sloping, the beaks rather less prominent, and the anterior lateral tooth rather 

 more approximated to the cardinals than is the case in Tellina glahrella. 



Length 10 mm., height 5f, diameter 2. 



Hahitat.—^t&tion 167a, Queen Charlotte Sound, Cook Strait, New Zealand, in 10 

 fathoms ; mud. 



Only a single specimen of this species was brought home, which possibly is not of the 

 full size it sometimes attains. It is a small pinkish shell, having the right valve a trifle 

 flatter than the left. It is thin, wedge-shaped behind, broad and rounded in front. 



