458 



MR. G. S. BRADY'S MONOGRAPH OF 



Jlavida is by no means a generally appropriate one, it seems better to retain the name 

 proposed by Dr. Baird. 



2. Paradoxostoma ABBHEViATrM, G. O. Sars. (Plate XXXV. figs. 22-25.) 

 Paradoxostoma abbreviatum, G. O. Sars, loc. cit. p. 94. 



Atlantic type ? Distribution: Recent — Britain, Ireland, Norway. Fossil — Glacial, Scotland. 



Carapace of the female^ as seen from the side, much shorter and higher than the 

 preceding, greatest height behind the middle, and equal to about two-thirds the 

 length; extremities rounded, anterior narrow, posterior excessively broad; superior 

 margin boldly arched, inferior deeply sinuate in front, very convex behind. Outline, 

 as seen from above, compressed ovate, about three times as long as broad. Colour 

 whitish or pale yellow. " Shell of the male and young female lower, inferior margin less 

 convex behind. Third joint of the upper antennae much shorter than the preceding, 

 fourth elongate, and about twice as long as the following two united ; terminal claws of 

 the lower antennae unequal, the anterior about twice as long as the posterior. Pirst pair 

 of jaws almost as in the preceding species. Last joint of the third pair of feet very 

 slightly ciliated. Distal portion of the male copulative organs large, subhamate, or 

 armed behind with a spiniform curved process." 



Length ^ in. 



Hab. Mostly beyond low-water mark. Plymouth Sound, 5 fathoms {Mr. C. Spence Bate) ; Girdler Sand 

 and Race's Bank {Mr. E. C. Davison) ; Lerwick and Cumbrae {Mr. D. Robertson) ; Lamlash (living 

 in tide-pools), Skye {Rev. A. M. Norman). 



The validity of this species seems to me open to considerable doubt ; and had it not 

 been for the slight differences of animal structure noticed by G. O. Sars, I should have 

 certainly considered it merely a variety of the preceding. Unfortunately, all the 

 specimens which I have seen are merely dried shells, and I have therefore had no oppor- 

 tunity of myself examining the recent animal. But the differences described by Sars are 

 after all very slight, and perhaps do not amount to more than ought to be allowed as 

 merely varietal. This can only be decided by further examination of this and such 

 intermediate forms as those figured (figs. 1-3, 12, 13), which it is now difficult to 

 refer with certainty either to P. variabile or P. ahhreviatnm. The form represented in 

 figs, 14-16 is, I believe, referable to the young of P. variabile. 



3. Paradoxostoma Normani, n. sp. (Plate XXXV. figs. 39, 40.) 



Carapace of the female, as seen from the side, subreniform, much narrowed in front, 

 highest in the middle ; greatest height equal to half the length ; extremities rounded, 

 the anterior narrow and produced, posterior broad. Superior margin arched, highest in 

 the middle, sloping steeply in front ; inferior deeply sinuated in front of the middle, convex 

 behind. Outline, as seen from above, ovate ; extremities pointed, widest in the middle ; 

 greatest width equal to one-third of the length. Shell pellucid, marked with dendritic 

 black patches, the brown body of the animal shining through the shell. Fourth joint of 

 the upper antennae more than twice as long as the fifth ; lower antennae short, terminal 



