NEW PEEIDHSIACEJ?: EEOM THE ATLANTIC. 329 



plates extending from the girdle to the apex ; apex elongate-acuminate ; distal limb 

 short, bluntly conical, but terminating in an elongate -acuminate apex slightly out of 

 the median line, composed of plates tapering from the girdle. (PI. XXVII. tig. 6.) 

 Its distribution is from the Azores to Panama. 



Ceratocorys, Stein. 



Ceratocorys horrida, the only species known hitherto, is abundant south of lat. 35° K. 

 to lat. 14° S. in the Atlantic and to Panama in the Caribbean. Stein gives it as from 

 Polynesia. Now and then we came upon a variety of it figured on PI. XXX. fig. 5 </, and 

 an encysted state, fig. 55. The variety (or possibly new species) is distinguished by having 

 its spines in one plane and by the slightly developed distal limb and girdle as seen in the 

 figure. 



In the gatherings of the ' Atrato,' lat. 32° N. and lat. 23°-24° N., we found Avhat was 

 undoubtedly the lid-like proximal limb of a Ceratocorys which we took to be new and 

 gave it a provisional name. It is represented in PI. XXX. fig. Qd. In the 'Elbe' 

 collections we found it again in lat. 2^ N. and on the Line, the lids being smaller and 

 plainly belonging to younger specimens (fig. 6 c). In spite of repeated search for the rest 

 of the organism we had given it up, when fortunately one appeared at the last moment in a 

 gathering from lat. 4°-6° S. We are thus able to give a description of this new species as 



C. SPINIFEE.A, sp. n. Body unequally divided by the girdle and marked with numerous 



small irregular pits over the plates; girdle marked by one row of rectangular 



areolae, both margins projecting and acutely serrate, but wdth a fine membrane 



between the teeth, ends oblique ; proximal limb the smaller, arched and lid-like, 



composed of four segmental plates with broad, thick, projecting ribs, honeycombed 



with pits at the junctions ; foraminal area (with foramen at the apex of the limb) 



on the specially broad rib w^hich runs down to the ends of the girdle, where it is 



depressed and continues as a furrow^ on the distal limb ; distal limb much larger 



than the proximal, composed of 4 (?) plates with six large four- winged spines 



below, the outer wing decurrent from the girdle, each spine with a stout, central 



axis giving off to each wing a row of secondary branches near the extremity. 



(PI. XXX. figs. 6 a, b,c, d). 



Its distribution is from lat. 28° N. to lat. 6° S. and evidently very rare, since w^e have 



met with it only five times, and in a complete state only once. Its main points of 



difference from C. horrida may be summarized as the arched lid with its broad, j^rojectino-, 



honeycombed ribs, its acutely serrate girdle, and its broader and shorter spines. 



On PL XXX. fig. 6 e there is represented either a younger state of this species 

 in which only two spines have appeared, or a variety with tw^o spines. The whole 

 organism is smaller than typical C. spmifera, which favours the former view^ ; on the 

 other hand, its two spines appear to be as well -developed as the six spines of the type. 



A comparison of the magnifications of the figures suggests either a great range in size 

 of this species, or that the form figured (PI. XXX. figs. 6 a, h) is not yet mature. Its 

 magnification is X 840, while that of the proximal limb (fig. 6 d) is x 410, and it is only 

 slightly larger in the figure. 



SECOND SERIES. — BOTANY, VOL. V. 3 C 



