328 MR. G. MURRAY AND MISS F. G. WHITTING ON 



the Caribbean Sea "between Jamaica and Colon and from the Atlantic between lat. 25° N. 

 and lat. 9' N. 



Pekidinium sph^ricum, sp. n. Body sj)herical and entirely free from markings, exactly 



diA'ided into two equal limbs by the girdles ; girdle unmarked, ends oblique ; plates 



of both proximal and distal limbs mostly 5-sided, large, and distinct ; foraminal 



area elongate, not depressed, foramen oval ; distal limb with apical pore. 



(PL XXX. figs. 1 a, b.) 



This species is closely related to P. Globulus, from which it differs in its larger 



plates and in the body and girdle being entirely free from the markings characteristic 



of P. Globulus. We have represented on PI. XXX. figs. 2 a, b, an organism which 



occurred in one gathering only and puzzled us not a little. It has no discernible girdle, 



no markings on the plates, but in other respects, especially the shape of the plates and 



the markings at their junctions and the foraminal plate, it strongly recalls P. Globulus. 



P. sphcericum occurs in the Atlantic from lat. M° X. to lat. 9"" X. 



P. SPIXULOSUM, sp. n. Body ovate, unequally divided by the girdle, ends of girdle 



meeting exactly, the whole surface strongly areolated with short thick spines at the 



angles of the 4-sided areolae ; proximal limb larger than distal ; foraminal area 



narrow. (PI. XXIX. fig. 8.) 



This minute species was found in one gathering, lat. 28° X., long. 40° W., in the 



voyage of tlie ' Atrato.' This species has a superficial resemblance to Protoceratium 



reticulatwm. 



PoDOLAMPAS, stein. 

 Podola77ipas bipes. Stein, and P. palmipes, Stein, occurred with very fair regularity 

 over the region we have examined, but particularly from lat. 40° N. southward. 



Amphidoma, Stein. 



Amphidoma Nucula, Stein, the only knoAvn species, occurred with great constancy 

 throughout the region examined. 



OxYTOXLM, Stein. 

 Oxytoivmn Scolopax, Stein, and O. const ricttim, Schiitt, range from the Azores to the 

 Equator in the Atlantic and to Panama in the Caribl)ean ; 0. diploconus, Stein, from 

 the Azores to Panama ; O. tessellatum, Schiitt, from lat. 35° X. to lat. 14° N. 

 0. Gladiolus, Stem, occurs only near the Azores in our gatherings, and 0. reticulattm, 

 Schiitt, from the Azores to lat. 19'' X. (Stein gives the Mediterranean as its home). 

 On PI. XXVII. fig. 7 we have figured 0. coiistrictum to show its chromatophores. 

 In addition to these species, Ave found another which must be recorded as new : — 



O. MiLNERi, sp. n. Body approximately spindle-shaped, unequally divided by the girdle ; 

 the whole membrane, except the girdle, finely punctate ; girdle with one row of 

 4-sided areolae ; proximal limb acutely conical, composed of long, narrow, tapering 



