326 ME. G. MUERAY A^^D MISS F. G-. WHITTING ON 



scattered punctate markings, two fine spines and a few shorter ones by foraminal 

 area ; distal limb composed of one large, somewhat crescent -shaped, apical plate, 

 and other smaller ones bordering the girdle, mostly nnmarked, two of them on the 

 ventral side depressed, with the one between them punctate. (PI. XXVIII. 

 figs. 5 a, h.) 

 Pigs. 5 c, d, e represent a variety Avith dome-shaped limbs, almost spherical in general 



outline; and fig. 5/ another variety, in which two horn -like projections take the place of 



the spines near the foramen. 



The whole body of J), scecularis has a very delicate and fragile look, and appears 



translucent from the faintness and fewness of the fine markings. Its range is from 



lat. 37' X., i. e. a little south of the Azores, to the Isthmus of Panama. 



pEEiDixiUM, Ehrenb. 



P. diver gens, Ehrenb., like Goniodoma acuminatum and Ceratimn Tripos^ has an 

 almost universal record in all our gatherings. Constant though its occurrence was, 

 it was by no means regular in form. The variations in form were such that it is difiicult 

 to believe that one species embraces them all. However, they did not occur mixed to any 

 great extent in the gatherings, but mostly one at a time, and in any case always one form 

 predominant, which seems to point to their l)eing not separate species but local varieties. 

 In the voyage of the 'Avon,' Capt. Rudge evidently passed through a shoal of F. diver'- 

 gens about 24 hours' steaming from soundings, and in the next gathering but one, when 

 just inside soundings, there was only one P. diver gens observed, and in place of this 

 species a shoal of Kalosphcera viridis. The figures (in PL XXIX. figs. 4 «, b) show, 

 in the larger one, an extreme form of P. divergens with its contents, and in the other 

 a form near it. P. Ilichaelis has a wide range like P. divergens, but occurs much more 

 sparsely. P. Globulus also has a wide distribution, ranging from lat. 6"" S. to lat. 44° X. 

 in the Atlantic. P. tristylum occurs sparingly from the Azores to Panama. We have 

 noted the following new species : — 



P. HiNDMAKCHii, sp. n. Body divided into two almost equal limbs by the girdle, 

 uniformly covered with large 4-5- sided areolae ; girdle similarly marked with one 

 row ; ends of girdle very slightly oblique ; foraminal area furrowed, elongate, 

 extending into distal limb; proximal limb widely bifurcate; distal limb bluntly 

 conical. (PL XXIX. figs. 1 a, b.) 

 In P. Sindmarchii and in the following species there is no apparent plate-structure, 



and we assume that the indications of its existence are obliterated by the large areolae 



which cover the whole body. The species occurs from about lat. 34° N., long. 39° W., 



to Panama, but never abundantly. 



P. LEioRHTKCHUM, sp. n. Body divided into two approximately equal limbs by the 

 girdle; girdle at one end broad, areolate, and very much narrowed at the other end 

 and without markings ; proximal limb composed of irregular plates bordering the 



