THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[THIRD SERIES.] 

 No. 86. FEBRUARY 1865. 



XI. — Carcinological Gleanings. — No. I. 

 By C. Spence Bate, F.R.S. &c. 



[Plate I.] 



A systematic series of dredgings of the coasts of the Shetland 

 Islands having been determined on by the British Association, 

 the carrying out of the labour was entrusted to a committee. 



The object with which the dredgings were undertaken was to 

 ascertain the relative distribution in the sea of the Mollusca. It 

 was therefore with the zeal of true naturalists that, while col- 

 lecting the shells, the committee provided for the preservation 

 of other animals. 



It is by this means, chiefly through the kindness of Mr. Jef- 

 freys, that a tolerably fair collection of Crustacea from this lo- 

 cality has found its way into my possession. Among them are 

 a few Diastylidse that have not hitherto, as I believe, been de- 

 scribed. 



They consist of two species of the genus Diastylis (to which I 

 have added a third from a still more northern locality) and one 

 of a genus that is new to science. This last is certainly a very 

 remarkable Crustacean. Unfortunately, it is not perfect, being 

 deficient of the four last segments of the pleon. The preserved 

 parts indicate an intermediate position between the true Diasty- 

 lidse and the Mysidse. 



Diastylis echinatus. Plate I. fig. 1. 



Carapace about one-third the entire length of the animal, and 

 as deep as half its length. The extremities of the antero-lateral 

 projections meet above anteriorly, and are elevated slightly up- 

 wards into a short rostrum, serrated dorsally and anteriorly and 

 tipped with a stout spine. 



A serrated ridge traverses the antero-lateral margin sub- 

 Ann. 2$ Mag. N. Hist. Ser. 3. Vol. xv. 6 



