380 bulletin: museum of comparative zoology. 



14-16 rows in each series, in the medium sized specimen as in the type, 

 in which many large eggs are clearly visible (Plate 2, fig. 4), and 

 equally regular, and precise in their arrangement, though it is im- 

 possible to determine the sex from surface views. In the smallest 

 specimen the gonads are represented by double rows, each of 14-15 

 small, oval thickenings in each interradius of the flask-shaped manu- 

 brium. 



Canal-system. As pointed out (p. 377) the canal-system of this 

 species shows that no sharp line can be drawn between Calycopsis 

 and Sibogita. In the smallest specimen, besides the four radial canals, 

 there are eight centripetals, all ending blindly at about f of the bell- 

 height (Plate 2, fig. 7), and varying only slightly in length. And 

 the same number of canals is to be seen in the medium sized specimen. 

 But corresponding to the increase in bell-height from 11 to 18 mm, 

 (Plate 2, fig. 5), the centripetal canals are proportionally longer, 

 reaching nearly to the apex of the bell-cavity, though all of them are 

 still blind. In the type-specimen, as already noted, two of the centri- 

 petal canals are still blind; but of the remaining six, three have joined 

 the cruciform base of the manubrium ; two join radial canals close to 

 their bases, and one joins a radial canal at a considerable distance 

 from the manubrium (Plate 2, fig. 1). Likewise, there are four very 

 short centripetal canals alternating with the large ones, such as I have 

 described for C. typa (1909b, p. 207, fig. 6, 7); and one of the latter 

 has a transverse branch nearly reaching the canal next adjacent, 

 suggesting such a union as occasionally takes place in C. nejnatophora 

 (1913, p. 24, pi. 2, fig. 8). In C. papillata as in C. typa and C. nema- 

 iophora, the four radial canals dilate just below their union with the 

 manubrium, to form the so-called "mesenteries" on the taxonomic 

 value of which Hartlaub (1913) has laid stress. But no trace is 

 to be seen of subumbral muscle-bands such as flank the canals in C. 

 nematophora. 



Tentacles. There are twelve tentacles in every specimen ; a tentacle 

 opposite every canal in the two smaller ones. In the type there is a 

 tentacle opposite each radial and each large centripetal canal, but none 

 opposite the small centripetals. Structurally the tentacles are of the 

 usual calycopsid type, the bases turned outward against the exum- 

 brella, so that they appear to arise some distance above the margin, 

 then bending sharply downward. In the smallest specimen several of 

 the tentacles bear spherical terminal knobs, such as characterize C. 

 nematophora. But, as, unfortunately, the tips of all the tentacles of 

 the two larger specimens have been destroyed, it is doubtful whether 



