REPORT ON THE SCHIZOPODA. 65 



of the first caudal segment, heing also partially overlapped by 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 ai'e very slightly produced, exhibiting at the sides 

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

 to the antenna! spine in other Podophthalmia. 



The live anterior caudal segments are pro\'ided with distinctly developed lamellar 

 epimera, projecting beyond the ventral face and pointing oblic^uely 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 with 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 developed visual elements. Moreover, they invarialjly contain within the 

 pedicle posteriorly and somewhat inferiorly a peculiar, highly luminous, organ (PL XL 

 figs. 7, h, 8), more fuUy described in the sequel. Between the bases of the eyes, too, may 

 l^e oljserved a small liut distinct spot of black pigment (the larval eye), apparently 

 containing anteriorly a minute refracting body (see PL XL fig. 7, a). 



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

 far lieyond the antennal scale, and cylindrical in form, with its three joints gradually 

 diminishing in size. The structure is precisely the same in l)Oth sexes. The basal joint 

 is somewhat 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 ciUated 

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

 exhil)its a longitudinal keel, and exteriorly, 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, beset with a fascicle of trans- 

 lucent sensory bristles. 



The basal part of the antenuEe (see PL XII. figs. 5, 6) is rather large, and divided 

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

 ventral face a small opening, surrounded by 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 fiageUum, somewhat longer than the flagella on the antennulse. 

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

 naked, terminating also in a ver)^ small dentiform projection, sometimes, however, 

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



(zooL. CHALL. EXP. — PART xxxva. — 188-5.) Oo 9 



