REPORT ON THE SCHIZOPODA. 65 



of the first caudal segment, heiiig also purtiall)' overlapped hy a lamellar projection 

 extending anteriorly from this segment. The anterior part of the carapace is generally 

 slightly keeled above, and projects into a more or less marked rostral process. The 

 antero-lateral corners of the carapace are very slightly produced, exhibiting at the sides 

 of the basal part of the antenuse a small dentiform projection, apparently corresponding 

 to the autennal spine in other Podophthalmia. 



The five anterior caudal segments are provided with distinctly developed lamellar 

 epimera, projecting beyond the ventral face and pointing oljliquely backwards. The last 

 segment is much narrower than the preceding ones, and rather compressed, without any 

 trace of epimera, but usually armed beneath its end witli a compressed tooth, placed 

 immediately anterior to the anal opening (preanal spine). 



The eyes are well developed, and generally of a pyriform shape, having the pedicle 

 composed^of two segments, and the cornea expanded, globular, with a very dark pigment, 

 and distinctly develoj^ed visual elements. Moreover, the}' invariably contain within the 

 pedicle posteriorly and somewhat inferiorly a peculiar, highly luminous, organ (PI. XT. 

 figs. 7, h, 8), more fully described in the sequel. Between the bases of the eyes, too, maj' 

 be observed a small l)ut distinct spot of black pigment (the larval ej^e), apparently 

 containing anteriorly a minute refracting body (see PL XI. fig. 7, <i). 



The antennular peduncle (see PI. XII. figs. 1, 2) is rather elongate, always projecting 

 far l)eyond the antennal scale, and cylindrical in form, with its three joints gradually 

 diminishing in size. The structure is precisely the same in both sexes. The basal joint 

 is somewliat flattened in its proximal part, and in some species exhibits at the end, above, 

 a small membranous lappet. Moreover, it is furnished with several finely ciliated 

 bristles, of which a dense fascicle is seen issuing from the outer corner. The last joint 

 exhibits a longitudinal keel, and exteriorlj^ at the end, a small lobe, from the base of 

 which issue two densely ciliated bristles. Both the flagella are rather elongate, though 

 far from attaining the length of the body, and consist of numerous small articulations. 

 The outer flagellum has at the l)ase a slight intumescence, l)eset with a fascicle of ti-ans- 

 luceut sensory bristles. 



The basal part of the antenuse (see PI. XII. figw. 5, G) i« rather large, and divided 

 into two indistinctly defined segments, of which the proximal exhibits on the 

 ventral face a small opening, surrounded 1))' a somewhat tubular projecting border, 

 the outlet of the so-called "green gland." The distal segment juts forth at the 

 end exteriorly beneath the scale, as a more or less elongate spine. The terminal 

 part of the antenna consists of a rather elongate three-jointed peduncle and a slender 

 multi-articulate flagellum, somewhat longer than the flagella on the antennulje. 

 The scale is more or less elongate-ovate in form, having the outer edge straight and 

 naked, terminating also in a xexy small dentiform projection, sometimes, however, 

 obsolete. The apex is truncated, and, like the inner edge, fringed with a dense row 



(ZOOL. CIIAIJj. EXP. PAHT -XXXVII. — 1885.) Oo 9 



