RECENT BRITISH OSTRACODA. 



:»*«> 



neatest height equal to half the length. Anterior margin flattened, waved, running 

 obliquely upwards and forwards, and bordered, in many cases, by a flattened spinous 

 lamina (figs. 14-17). Dorsal margin forming a flattened arch, truncate in the middle; 

 ventral straight or slightly waved, bulging into a protuberant angle at its junction with 

 the anterior margin. Posterior margin narrow, rounded, or almost angular, and fre- 



quently encircled by a narrow squamous lamina, which is irregularly dentated or spinous 

 (figs. 13-17). Outline as seen from above tumid, oval ; greatest width in the middle, 

 equal to rather less than half the length; extremities obtusely pointed; line of junction 

 of the valves waved; on the ventral margin the left valve much overlaps the right. 

 End view subtriangular, broad and rounded below; width and height nearly equal. 

 Surface smooth and polished, or finely punctate; pearl-white or cream-coloured. Th< 

 anterior extremity of the carapace bears sometimes, in old and well-grown specimens, 

 a number of short pointed tubercles, and is occasionally, as also the hinder extremity, 



beset with coarse brown hairs (fig. 13). Lucid spots six to nine, arranged in a rosette. 



Postabdominal rami terminating in two slender curved claws; the internal very long 



and finely tapered, considerably exceeding in length the ramus itself; the external 

 more slender and about half as long : on the internal border of the ramus, and very near 



its apex, are five slender seta3 ; the upper two very short, the rest about equal in lengi 



i 



to the shorter claw. 

 Length -£$ in., height 



M. Norman) 



Alsh and the Minch 



(Mr. Jeffreys'* dredqings) : Shetland (Mr. D. Robertson), off Hoy Head (Mr. D. 0. Drewett) 



on- 



u 



(Mr. Spence Bate's dredging,) ; in shell-sand from Arran and Galw ay Bay W 

 Rowney), and from Roundstone (Dr. Aleock); dredged in Poolvash Bay, Isle of Man, l*-16 lath., 

 and in Birterbuy Bay, 10-15 fath. (G. S. B.). 



This yery interesting form was first described as a distinct species by the Rev. A. 11 

 Norman, nnder the name of Cythere inflate. Mr. Norman's specimens woe taken from 

 shell-sand dredged in Lamlash Bay, from which locality Prof. T. Rupert Jones bad , ... 

 previonsly obtained the species, considering it a variety of Ba*d» suMelto,dea_ 

 characters are, however, very distinct and constant ; and although some form. M .**■ 

 Mtoidea approach it very closely, I agree with Mr. Norman » the opnnon that ,t shou 

 be regarded as a distinct species! The typical form of 3. suMeltoulea has rnot^ » «• « 

 I know, been met with, L a recent state, in the ^~^**2£?,£S 

 occur in Mr. Jeffreys'* Channel-Island dredgings, but they have *»2""2?™ 



**■ ; and as several Foraminifera dredged in ^J^^^ £ 

 ;ome submarine fossiliferous bed, the most reasonably ^ mferen e t ^^ 



bkewise derived from the same source ^^^^XfoL forms with which it 

 >n the same dredgings, and is abundantly distinct from the lossu 



was associated. , neighbouring seas, but 



Bairdla inflata is tolerably abundant in Galway Bay and the ^ « . ^^ j 



appears to decrease rapidly in numbers to the east. On the 

 have no record of its occurrence. 



