56 



At least mth regard to the structure of the pupaj we know, Spheeronella Argisscr, 

 Sphmr. insignis and Choniostoma mirabile come rather close to the two preceding species; 

 each of them will now be treated separately. 



Sph(P.roneUa Aygissm. Of this species I have found a single female pupa (pi. IV 

 fig. 3 1 and fig. 3 m), which in the most important features agrees with the female pupa of 

 S. Giardii. The body is ovate, naked all over, 15 mm. in length, and, like the last-men- 

 tioned species, provided mth the pouch-like processes, in which antennulse (a), antenna; (c), 

 maxillulse (e) maxillae (f) maxiilipeds (g), trunk-legs and caudal stylets (p) are developed, and 

 all these processes show about the same relative size as the corresponding organs in the 

 females compared with each other; moreover, the mouth is distinct, and the mandibles are 

 also seen in fig. 3 1. The animal is attached by a very peculiar crooked funnel of conside- 

 rable size (s), which is of course made of a viscous substance, and its narrower, though 

 comparatively thick, base proceeds from the front. 



Sph(BroneUa insignis. Of Diastylis coynnta Boeck a single pupa was found (pi. X, 

 fig. 1 h), '14 mm. in length and sub-globular in shape. The mouth is well developed, as in 

 an adult female; antennulae, maxillulse, maxillse and maxiilipeds are seen as protruding naked 

 pouches of somewhat irregular shape ; in front of the mouth are found two rather large, odd, 

 connected areas, and close behind them a smaller spot on each side of the median line; in 

 front of, and in an oblique direction from, the maxillulae, theie are several small areas, and 

 finally a large transverse area, expanded in the middle, which joins the bases of the maxiili- 

 peds. All these areas are naked, and more or less prominent compared with the surroun- 

 ding skin. Except these organs and areas and the surface between them, the whole ventral 

 surface of the pupa and its sides are covered with hairs of medium length; the back is 

 covered in the same way on its most anterior part and on its posterior half, whereas a broad, 

 transverse area extends over the larger part of its anterior half; this area is naked, and 

 closely covered all over with irregular projections of a comparatively rather considerable 

 size, the real shape of which can only be recognised when seen obliquely, whereas a perpen- 

 dicular view gives the impression that this surface is covered with numerous irregular lines, 

 formiug ovals, oblong spots or simply flourishes. I have been unable to find out with 

 certainty the sex of this interesting pupa, as the adult male of this species is devoid of 

 trunk-legs; however, I consider it to be a female. 



Ghoniostoma mirabile. On the gills of a Eippolyte Gaimardii M.-Edw. I have 

 found a number af larvae, wliich showed all the stages transitional to that of the pupa, 

 besides numerous fully developed pupae (pi. XI, fig. 1 g — 1 k). A comparison between the 

 figures 1 h, 1 i og 1 k, which are drawn to the same scale of enlargement, will show that 

 the pupae differ much in size and somewhat in shape; the largest specimen I have measured 

 is -38 mm. broad and -27 mm. long, the smallest only -27 mm. broad and -19 ram. long, 

 and one specimen, which was still enclosed in the skin of the larva, is only '19 mm. broad 

 and 18 mm. hmg. So the pupce grow very considerably after breaking out of the larval 



