TRANSACTIONS OF SECTION D. 691 



pliorescent organs iu the peuultiinate segment of the .'xbdomen, the ciilit-lc is 

 glandular. 



Lepidopf.era. — An interesting example of protective resemblance was furnished 

 by a small Geometer larva which was found feeding on the budding inflorescence 

 of a spira;a-like plant. The larva was pale green in colour and provided witli 

 pairs of spine-like processes on the fourth to the eighth and on the eleventh 

 segment ; to each of these spines was attached by a delicate secretion of glutinous 

 sdk a string of buds of the inflorescence on Avhicli the larva? fed. As these bads 

 withered and turned brown they were cast off and renewed by fresh green ones. 

 The larva did not move about much, but even when it did it was well-nigh 

 indistinguishable from its food-plant. The pupa, which was enclosed in a silken 

 cocoon covered with green buds, was unfortunately destroyed by ants, and no 

 other specimen was obtained. 



Diptera. — Some larvse closely resembling Vermileo were discovered on Mount 

 Penrissen, Sarawak, at a considerable altitude. Thelarvro formed pitfalls in sand, 

 after the manner of ant-lions. Their habits have been described elsewhere. 



A larva, apparently allied to Microdoji, was found in some numbers under the 

 ■ sheathing learves of a Caryota palm : it was remarkably slug-like in appearance, 

 showing no signs of segmentation. The upper surface of the body was highly 

 convex, and from the posterior end protruded a short median tube at the base of 

 which was situated a spiracle ; the ventral surface was flat and transversely wrinkled ; 

 there were no legs or pseudopods ; the chitinous head was completely retractile. 

 At the time of pupation the larval skin became strongly chitinised, forming a 

 puparium inside which the further transformation took place. 



All the aquatic dipterous larvje obtained were closely allied to, if not 

 identical with, such well-known European forms as Coreihra, CMronnmus, 

 Tani/pus, En'!<t(iHs, Stratiomi/s, &e.' 



5. Zebras and Zehra Hyhrich. By Prof. J. Cossar Ewart, M.D., F.E.S. 



6. On Echiiionema grayi, a larye Nematode from the Perivisceral Cavity 

 of the Sea-urchin. By James F. Gemmill, M.A., M.D. 



The author exhibited some specimens of a large nematode from the perivisceral 

 cavity of the sea-urchin and gave an account of their occurrence and anatomv. 



Females. — Body elongated, 600-1,500 mm. in length ; 2— i mm. in breadth • 

 white or semitransparent, tapering at both ends, the posterior end being slightly 

 blimter and curved hi a half-circle. A delicate cuticular hook at both ends. 

 Moutli and anus entirely absent; tJie whole body covered by a delicate cuticle 

 and the body wall thrown into a series of shallow transverse folds alonn- either 

 side. ° 



Hypodermis, a single layer of nucleated cells ; muscular system, a single layer 

 •of cells beneath hypodermis, arranged in somewhat irregular longitudinal rows 

 along the central third of the body wall, and arranged less markedlv in transverse 

 rows on the dorsal two-thirds of the body -wall. Excretory system of canals 

 absent. Nervous system, a thickening of the hypodermis at 'head end, not con- 

 tinued backwards into longitudinal cords. Alimentary canal apparently a mass 

 of spongy reticular tissue, with nuclei and protoplasmic masses at intervals, 

 with an irregular lumen ending blindly at either extremity. Ovary single' 

 gi-eatly elongated ; development internal, with total unequal segmentation, followed 

 by a luodihed form of gastrulation. 



Males.— ^Iwch. smaller, 50-200 mm. in length, with tail coiled characteristically 

 in a spiral, with two equal spicules close to posterior extremity. 



This nematode seems to have hitherto escaped notice, except for a mention 

 by A. E. Shipley,'- whose specimen did not allow him to investigate its structure. 



' Some of the above noted insects will later form the subiect cf special memoiis 

 = (?.t7'.il/.6'., ICOO, p. 281. - ^ e • 



