On Uie Decapod Crustacea of the North Atlantic. J 87 



slightly enlarged, sliowing the spiniform terminations of the 

 acanthopores and the perforated tabulse closing the tube-mouths. 

 (Copied from Lonsdale.) 



Fig. 12. A few of the cell-mouths of Stenopora tasmaniensis, enlarged 

 about twenty-four times. The acanthopores are seen, and some 

 of the tube-mouths are furnished with a perforated tabula. 



Fiy. 13. Longitudinal section of a froudescent specimen of «S'. tasmaniensis, 

 enlarged about twenty-four times. 



Plate IV. 



Fig. 1. Transverse section of the type-specimen of Steiiopora crinita, 

 Lonsd., enlarged about twelve times. 



Fig. 2. Part of the same section, enlarged about twenty-four times. 



Fig. 3. Longitudinal section of the same, enlarged about twenty-four 

 times. 



Fig. 4. Tangential section in the peripheral region of the corallum of 

 another specimen of S. crinita, enlarged about twenty-four 

 times. The section traverses in part the thickened portions of 

 the corallites and in part the unthickened segments. 



Fig. 5. Longitudinal section of the same specimen, enlarged about 

 twenty- four times. 



XVII. — The Abyssal Decapod Crustacea of the ''Albatross'' 

 Dredgings in the North Atlantic *. By SIDNEY I. Smith. 



The most interesting feature of the Crustacea collected by 

 the ' Albatross ' is the great number of very deep-water or 

 abyssal species of Decapoda obtained in a restricted region of 

 the western North Atlantic. The whole number of species 

 of true Decapoda dredged by the ' Albatross ' is over 130 ; 

 but nearly half of these are from shallow or comparatively 

 shallow water. None of the shallow-water species were taken 

 below 1000 fathoms, and it is perhaps best to limit the 

 abyssal fauna to depths greater than this, although some true 

 deep-water species are excluded by adopting so great a depth. 

 Taking this limit strictly we have 44 abyssal species, as 

 shown in the following : — 



* This article is in the main abstracted from the introductory portion 

 of the author's '' Report on the Decapod Crustacea of the ' Albatross ' 

 Dredgings off the East Coast of the United States during the Summer 

 and Autumn of 1884," with twenty plates, recently presented to the U.S. 

 Commissioner of Fish and Fisheries, by whose permission it is here pub- 

 lished in advance of the Government report. The collections made by 

 the ' Albatross ' in the West-Indian region during the winters of 1884 

 and 1885 are nut referred to in this article, which applies exclusivelv to 

 the region north of Cape llatteras ; but some of the results of a pai-tial 

 examination of the collections made in the summer of 1885 are included. 



