436 



MR. G. S. BRADY'S MONOGRAFH 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 antennge 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 in. 



Hub. Hebrides^ the Miuch {Mr. J. G. Jeffreys) ; Guernsey, Falmouth, Burrow Island, Skye, Lamlash 

 Bay, and in tide-pools, Herm {Rev. A. M. Norman) ; in shell-sand, Girdler Sand, Margate, and 

 River Ribble {Mr. E. C. Davison) ; Devonshire coast, 5-60 fathoms {Mr. C. Spence Bate) ; Ormes- 

 liead, 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 (b. SJ. B.) ; Norfolk coast {Mr. D. O. Drewett). 



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

 in referring this species to his Cytherkleis tamariudus. I have never seea any valves con- 

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



5. LoxocoNCHA GUTTATA (Norman). (Plate XXVII. figs. 40-44.) 



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



Brit. Assoc. Report, 186 i, 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 

 of 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 pittings, 

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

 irregular furrows. Colour straw-coloured, brown, or slaty-blue. 



Length ^ in. 



Hab. Deep yrater : Plymouth {Rev. A. M. Norman) ; Devonshire coast, 60 fathoms {Mr. Spence Bate's 

 dredginys) ; Girdler Sand, Thames {Mr. E. C. Davison) ; Aberdeenshire coast {Mr. Dawson) ; in 

 shell-sand from Stranraer, Roundstone, and Galway Bay; Birterbuy Bay, dredged; Norfolk coast; 



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

 the following joints are always meant. 



