CYCLOPOIDEA. ]J29 



confident of having the adult form, the characters probably admit of 

 being employed. 



Caudal stylets. — The stylets are never as long as the abdomen, and 

 are sometimes shorter than their breadth. In some species, they 

 appear to be constantly diverged, while in others they are parallel. 

 There is usually a slight pubescence on the inner margin. They 

 bear at apex five plumose caudal setae : the second is the longest, as in 

 the Calani, being usually about as long as the abdomen, though some- 

 times exceeding it; occasionally it is nearly twice as long as the 

 other setae. In a few species, the outer seta proceeds from the outer 

 side of the stylet, near its middle. There is also a minute inner seta, 

 which is commonly bent, making the whole number six, as elsewhere 

 stated. 



Eggs. — Out of the thousands of Pontellae, collected through the 

 Atlantic, Pacific, and Indian Oceans, during three and a half years of 

 investigation, I did not succeed in capturing one with a bag of eggs 

 attached; and it is therefore probable, that the eggs are extruded 

 directly from the body, without forming an external ovarian sac. 

 Some of the females, however, contained internal ovaries which were 

 very distinct. They extend up the cephalothorax on either side, from 

 the abdomen to the mouth or beyond it, and the two lines, which are 

 irregularly flexed or convoluted, are united just posterior to the 

 mouth, after which they are disunited and continued on separate. 

 Glands evidently seminal, having the same position, were observed in 

 some males. 



In many species, oblong blue-black glands occur either side of the 

 medial line in the posterior part of the cephalothorax; and often 

 there is a second pair, a little in advance; and in other species, the 

 line is farther continued, with or without interruptions. These are 

 evidently portions of the ovarian organs in females, or of the sper- 

 matic in males; although, differing in their depth of colour from 

 glands distinguished in other cases as of this character. On the death 

 of the animal, the blue colour after a while spreads, and gives an 

 indigo tint to the adjoining parts of the animal. 



Colour. — Sea-blue and purplish blue are the prevailing tints of the 

 Pontellae : yet, there are some colourless species. Moreover, some 



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