4:J« 



MR. G. S. BRADY'S MONOGRAPH OF 



joint about equal in length to the three following*, last joint very slender and much longer 

 than the preceding; third joint of the lower antennae shorter and thicker, two setae 

 attached about the middle of the anterior margin. Eeet, especially the last pair, much 

 elongated ; the second joint of the last pair longer than the two following joints. Copu- 

 lative organs of the male much shortened; apical portion indistinctly separate from the 

 basal, acutely produced in front, rounded behind. Eyes distinct." Shell of the male 



slightly more elongated. 



[length Vs in. 



Hah. Hebrides, the Minch (Mr. J. G. Jeff) 



M, 



Falmouth, Barrow Island, Skye, Lamlash 

 in shell-sand, Girdler Sand, Margate, and 



Mr 



head, Peterhead, Macduff, Cumbrae, and Shetland (Mr. D. Robertson) ; Aberdeenshire coast (Mr. 

 Dawson) ; Northumberland and Durham coasts, in tide-pools and in 30-46 fathoms ; Galway, 

 Roundstone, and Birterbuy Bays, 1-15 fathoms; in shell-sand from Stranraer and South Wales, and 

 in tide-pools, Sunderland (G. S. B.) j Norfolk coast (Mr. D. 0. Dreivett). 



From an examination of Prof. T. Ttupert Jones's type specimens, I have no hesitation 

 in referring tiiis species to his CytJierideis tamarindus. I have never seen any valves con- 

 taining the animal, except two or three Norwegian specimens kindly sent to me by Sars. 



6. Loxoconcua guttata (Norman). (Plate XXVII. figs. 40-44.) 



Cythcre guttata, Norman, Nat. Hist. Trans. Northumb. and Durh. vol. i. p. 19, pi. vi. figs. 9-12, and 

 Brit. A ,oc. Report, 1864, p. 192. 



British type. Distribution : Recent— Great Britain, Ireland, Bay of Biscay, Levant. Fossil— Glacial 



and postglacial, Scotland, Ireland. 



Valves of the female, seen from the side, rhomboidal or peach-stone-shaped ; greatest 

 height equal to much more than half the length. Dorsal margin straight or only slightly 

 arched, angular at each extremity. Ventral margin convex, sinuated at the anterior 

 third. The lower half of the anterior border is rounded ; the upper half flattened, and 

 sloping backward to its junction with the dorsal border ; posterior margin obliquely 

 rounded below, produced into a rounded angular projection about the middle, obliquely 

 truncate and emarginate above. Seen from above, the carapace is ovate, tumid, widest 

 behind the middle ; strongly keeled ; extremities obtusely mucronate, greatest width 

 equal to half the length. The'end view is very broadly ovate, almost circular. The shell 

 ol the male is much more elongated, the dorsal margin quite straight and obtusely 

 angular at each extremity, ventral margin only slightly convex behind. The greater 

 portion of each valve is covered with large and sharply defined, deep, angular pitting*, 

 but these are wanting round the margins : on the ventral surface they coalesce into 





fun 



Length Jg- in. 



Colour straw-coloured, brown, or slaty-blue 



dredginys) ; Girdler Sand, Thames (M, 



M. Norman) 



{Mr 



(Mi 

 dredged; Norfolk 





in 



As tins phrase occurs frequently in the course of the Monograph, it should be stated that the united lengths of 

 oliowing joints are alwavs m^nf 



