NEW PERIDINIACE.T. EROM THE ATLANTIC. 325 



GoNiODOMA MiLNERi, sp. D. Body unequally divided by the girdle ; membrane, including 



that of girdle, finely punctate ; proximal limb the smaller, dome-shaped, but the 



upper plates forming a projection, tlie lower plates broad at their bases wliere they 



join the girdle, narrowing upward ; forarainal area irregularly elongate ; distal 



limb box-shaped, the sides composed of six plates, four of them nearly square, two 



oblong and a flat bottom, with short spines projecting downward at the junctions 



of the plates and at the ends of the girdle. (PI. XXVII. figs. 2 a, b, <?, d.) 



Figs. 2 a, 6 represent the tyj^ical form of G. Milneri. Pigs. 2 c, d, representing 



another form (one encysted), are noteworthy as showing the body divided into more 



equal halves, this equality being attained by a narrowing downward of the distal 



limb. The divergence of this form is so great and so fixed as almost to entitle it to 



specific rank. The species differs from G. acuminatum mainly in the typictil unequal 



division of the body and its shape, the projection on the proximal limb, and in the 



possession of spines. In this last respect it is approached by G. acuminatum, var. 



armatum, Schiitt. Its range is from the Azores to the Caribbean Sea. 



G. FiMBRiATUM, sp. n. Body divided into two limbs almost equal in bulk but of different 

 shapes ; membrane finely punctate ; girdle projecting at both margins as a fine 

 membrane with a row of acute tooth-like supj)orts ; proximal limb narrowing towards 

 the flat base, armed with short spines at the junctions of the plates ; distal limb 

 dome-shaped, composed of six plates, broad at the base, narrowing upward, where 

 they join an apical six-sided area. (PL XXVII. figs. 1 «, b.) 

 Its range, so far as we can tell at present, is between lat. 40^ N., long. 29° W., and lat. 



14 N., long. 71° to 76 W. 



G. SPH^ERicuM, sf>. n. Body spherical and symmetrically divided by the girdle ; margins 

 of girdle prominent and unmarked ; six plates of distal limb broad at the base 

 where they meet the girdle, narrowing above and converging towards the square, 

 arched, apical plate ; the plates of proximal limb nearly the same in shape and 

 arrangement, but differing slightly owing to the presence of the foraminal area ; 

 an apical pore present on the proximal plate. (PL XXVII. figs. 3 a, b.) 

 This species is at once distinguished from the others by its spherical shape, thou^'h 



the arrangement of its plates proclaims it a true Goniodoma. So far as our records 



show, its distribution is very limited, viz. from lat. 35° X., long. 29' W., to lat. 27° N., 



long. 41° W. 



DiPLOPSALis, Bergh. 

 Biplopsalis Lenticula, Bergh, the only species hitherto known, appears only once in 

 our record, viz. in lat. 25° 41' N., long. 49° 31' W. A new species, of very distinct 

 aspect, appeared in our captures of 22nd June, the day of Her Majesty's Jubilee, and 

 in commemoration of the fact we have named it 



D. s^cuLARis, sp. n. Body in the girdle-view an irregular ellipse, divided by the girdle 

 into fairly equal limbs ; girdle fimbriate on botli margins, with the ends widely 

 oblique; proximal limb composed of irregular four-sided plates, each with a few 



