BIGELOW: MEDUSAE AND SIPHONOPHORAE. 379 



cant in this species than it is in C. typa, or in C. nematophora (1909b, 

 1913), where it is either a temporary contraction phase, or the result 

 of preservation. In all three specimens the apex of the bell is rounded, 

 with no trace of the funnel-shaped apical depression, so characteristic 

 of C. typa (Bigelow, 1909b, fig. 1). 



It is characteristic of Calycopsis that the tentacular roots lie in 

 furrows of the exumbrella. And these are much deeper in C. papillata 

 (Plate 2, fig. 2) than in any other specimens of the genus which I have 

 studied (1909b, fig. 1; 1909a, pi. 43, fig. 2; 1913, pi. 3, fig. 1), the 

 gelatinous substance between every two tentacles forming a well- 

 marked lobe, or ridge, which projects downward below the margin in 

 a manner better illustrated by Plate 2, fig. 2, 3 than verbally. And 

 it is the distal extremities of these ridges, below the level of the bell- 

 margin, that bear the gelatinous papillae which are one distinctive 

 feature of the species. These are conical in outline, rigid in substance, 

 situated in 1-3 irregular rows on each marginal lobe, the number, in 

 four successive lobes of the type-specimen, being 9, 11, 6, 7. In the 

 18 mm. specimen, they are equally vmmistakable, though fewer in 

 number (4-6 per marginal lobe), and the lobes themselves smaller. 

 In the smallest specimen most of the lobes bear at least one papilla, 

 though two are smooth. And even thus early the lobes themselves 

 are as large as the corresponding structures in adults of other species 

 of Calycopsis. 



Manubrium. The manubrium is much smaller in C. papillata than 

 in Atlantic specimens of C. typa (Bigelow, 1909b, fig. 1); or in C. 

 nematophora (Bigelow, 1913, pi. 2, fig. 8), being only about 5 mm. 

 long in the type, in which it is slightly contracted, contrasted with a 

 length of 13-15 mm. in C. typia of corresponding size. It is 4 and 2 mm. 

 long, respectively, in the two smaller specimens. And as it is corre- 

 spondingly narrow, it gives the Medusa an aspect very different from 

 that of C. typa (incl. C. navarchus). 



In the type-specimen the lip is irregularly' folded ; in the two smaller 

 ones circular; and in all three its margin is smooth, without any trace 

 of the labial nematocyst knobs which characterize C. nematophora. 

 The gonads (Plate 2, fig. 4) much resemble those of C. typa, thpre being 

 two rows of narrow, regular genital folds in each interradius, alter- 

 nating with smooth zones in the perradii where no sexual tissue is 

 developed. But the irregular sexual lobes seen in C. typa do not occur 

 in our specimens of C. papillaia, nor is there any trace of the irregular 

 net-work which characterizes the mid-line of each interradius in C. 

 nematophora. The genital folds are nearly as well developed, with 



