334 ME. G. MUEEAT AND MISS F. G. WHITTING ON 



the Caribbean. It is most nearly allied to S. Franceses, from which it differs in the 

 totally different sail, the plain, unpitted, and not decurrent collar, and the shape of the 

 body. It is constant in all its characters except the markings on the sail and the 

 slightly varying shape of the proximal limb. 



HiSTiONEis DENTATA, sp. n. Proximal limb semi-ovate, laterally compressed halfway 

 towards extremity, pitted, with an irregular flat sail ; sail narrow in its upper part, 

 but at once widening, then narrowing again irregularly, with large pits of varying size, 

 and with one supporting thickened bar projecting from the extremity of the limb 

 and the sail itself extending beyond it on the dorsal side ; girdle pitted, expanding 

 at proximal margin into a collar, with one large, clear, unmarked area on each half, 

 but supported on the dorsal and ventral sides by thickened pitted ends, open at both 

 dorsal and ventral sides and decurrent on one side in a narrow thickened and pitted 

 band past the foramen to the sail ; distal margin expanding into a funnel with a 

 dentate edge, and with much thickened, upriglit, radiate bars, each thickest at the top 

 and toothed in a radial direction ; distal limb reduced, but bearing a tuft of upright 

 spines emerging slightly above the funnel. (PL XXXIII. figs. I«, b.) 

 Found onlv in lat. 2I°-25' N., long. 51-50" W. 



H. HiGHLEii, sp. n. Proximal limb pitted all over, hollowed above at the girdle, and 

 continued downward into a long cylindrical extension rounded at the end, giving 

 the whole limb a trifurcate appearance ; with sail narrow where it joins the limb, 

 broadening outwards, supported at its upper and lower margins by thickened bars, 

 unmarked except in lower outer corner ; girdle pitted, with its proximal margin 

 expanding into a large, high, unmarked collar slightly constricted near the top, open 

 on both dorsal and ventral sides, and bearing as an appendage on the ventral side a 

 membranous expansion like a small sail set above the true one ; upper margin of 

 girdle expanded into a funnel narrow and unmarked below, then slightly pitted 

 where it begins to expand, and with radiate thickened bars above, the bars bearing 

 each a minute knob at the top, edge of funnel entire ; distal limb almost suppressed, 

 consisting of a minute flat membrane at base of funnel. (PL XXXII. fig. 5.) 

 Prom lat. 31' X. to lat. 23° N. in the Atlantic. 



H. MiLNERi, sp. n. Proximal limb short, stout, curved, ftiintly and sparsely pitted, and 

 with a row of distinct punctate markings where it borders the girdle, and a similar row 

 parallel to it on the girdle itself, bearing on the ventral side the sail supported by 

 thickened curved bars top and bottom, [and bordered with parallel peripheral 

 thickened lines with two lateral flaps beneath ; proximal margin of girdle expanded 

 into a wide high collar unmarked in its lower half, but with a reticulum of fine 

 nerves on the upper half, open on the dorsal and ventral sides and supported by 

 thick upright bars at the openings, one side decurrent in a large wide expansion, 

 which meets the sail and forms in fact itself an upper sail with reticulate nervation 



