OF NEW ZEALAND. 113 
appendages, the inner plate truncated, the outer acute, and curving 
outward at the extremity. Length 3 lines. (M. E.). 
New Zealand (Coll. Mus. Paris); Bay of Islands (Dana). 
In the specimens referred to this species by Dana, the tooth of the 
seventh thoracic segment is sometimes obsolescent; last segment of 
the abdomen triangular, sides obsoletely simuous, apex narrow and 
obtuse, dorsal surface near base with two slight prominences, cavity 
below narrow at apex, caudal lamellx not reaching to apex of abdomen, 
inner truncate, outer acuminate, tip curved outward a little, &c. 
Colour whitish, bluish-white ; also brownish, with whitish spots. 
121. Isocladus spiniger. Pl. Ill, fig. 4 ¢; 4a, 9. 
Sphaeroma diadema, (part) List Crust. Brit. Mus. p. 104, ( 1847), 
nec Leach. : 
Sphaeroma spinigera, Dana, U.S. Explor. Exped. xiv, Crust. part 1, 
p. 780, pl. lu, fig. 8, (1853). 
Near S. armata in form, caudal lamelle, and abdomen above and 
below. Body more depressed, smooth, naked, apex of abdomen more 
blunt. Tooth of seventh thoracic segment elongate, spiniform, longer 
than half the abdomen. Caudal lamelle broader, and extendmg a 
little beyond the abdomen, outer near its apex obsoletely serrulate. 
Colour brown, or brownish-green ; some specimens with a longitudinal 
medial broad line of emerald green. Length 3-4 lines. (D.). 
New Zealand (Coll. Brit. Mus.); Bay of Islands, along shores of 
Parua Harbour (Dana). In bored wood and in pools of water. 
In most of the specimens in the Collection of the British Museum 
the dorsal spine curves very slightly downward, and does not project 
as far as the extremity of the terminal segment. 
Var. recurvatus. Pl. III, fig. 4b. 
In this variety, the dorsal spine is curved slightly upward at its 
extremity, and projects about as far as the extremity of the last 
abdominal segment. 
CYMODOCEA. 
Cymodocea, Leach, Dict. Sci. Nat. xii, p. 341, 342, (1818); M. 
Edw. (part) Hist. Nat. Crust. iii, p. 212, (1840); Dana, U.S. Explor. 
Exped. xiv, Crust. part il, p. 748, (1593). 
