Rev. A. M. Norman on an undescribed Crustacean. 429 
T. Perroteti. Pl. VII. figs. 5, 6, 7. 
Psammophis Perroteti, Dum. & Bibr. vii. p. 898. 
Dryophis tropidococeyx, Gthr. Catal. Col. Snakes, p. 157. 
Brownish-green; without epidermis, green (Dryophis); a 
whitish line along the side of the belly (Dryophis). Upper 
labials eight, the fourth and fifth * coming into the orbit. One 
anterior and one posterior ocular. Scales in fifteen rows. 
Hab. Madras. 
LV.—On an undescribed Crustacean of the Genus Mysis. 
By the Rev. Atrrep Mertz Norman, M.A. 
[With a Plate.] 
THREE members of the genus Mysis are described in ‘ Bell’s 
British Crustacea.’ Since the publication of that work, the 
number of British species has been doubled. In the year 1853, 
Mr. Gosse described a new form in this Journal under the name 
of Mysis productust. In the spring of 1855, I met with two 
additional species in reck-pools at Falmouth ; and these were 
described the following year by Mr. R. Couch, who had taken 
them at Penzance{. The six above-mentioned species, together 
with that now to be characterized, may be divided into the 
following sections :— 
A. Telson (central lamina of the tail) with the apex bifurcate. 
Mysis flexuosus, Miiller; Mysis Lamorne, R. Q. Couch; 
Mysis Spiritus, n. s. 
B. Telson with the apex entire. 
Mysis vulgaris, J. V.Thompson ; Mysis Oberon, R. Q. Couch ; 
Mysis Griffithsia, Bell; Mysis productus, Gosse. 
It will be necessary, in order to draw attention to the distin- 
guishing characteristics, to describe the species of the first section. 
Mysis flecuosus, Miiller. Pl. VIII. figs. 2 & 3. 
Cancer fleruosus, Miiller, Zool. Dan. vol. iv. p. 34, tab. 66. 
Mysis spinulosus, Leach, Linn. Trans. xi. p. 350; Desm. Consid. p. 242; 
M.-Edw. Crust. ii. p. 457. 
Praunus flecuosus, Leach, Ed. Ene. vii. p. 401. 
Mysis Chameleon, J. V. Thompson, Zool. Researches, p. 28, figs. 1-10; 
M.-Edw. Crust. 457; Bell. Brit. Crust. p. 336; White, Pop. Hist. Brit. 
Crust. p. 143. 
Mysis Leachii, J. V. Thompson, Zool. Researches, p. 27. 
Mysis albescens, cinereus, viridis vel brunneus. Thorax cylindricus. 
* My former statements, that the third and fourth (p. 157) or the fifth 
and sixth (p. 158) upper labial shields enter the orbit, are erroneous. 
+ Ann. & Mag. Nat. Hist. 2nd ser. vol. xii. p. 156, pl. 6. fig. 5. 
t The Zoologist, vol. xiv. (1856), pp. 5284-5288. 
