136 NOTARCHUS. 
Section Notarchus Cuv., s. str. 
In the typical species of Notarchus the body is very plump and 
not excessively elongated or slender at the two ends; there are no 
distinct labial processes ; the sole is extremely narrow; and the in- 
tegument bears conic warts, often more or less branching, but not 
forming long, finely cut arborescent processes asin Aclesia. The 
typical forms are NV. indicus and N. punctatus. Some other small 
species with lengthened extremities and smoother integument, such 
as NV. nudatus and N. citrinus probably belong here also; while N. 
ocellatus and N. polyomma are still very imperfectly known. 
N. rnpicus Schweigger. PI. 40, figs. 14, 15,16; pl. 61, figs. 56, 57, 
58. 
Length 3-43, breadth 2, alt. 2°3 em. Head about one-third as 
wide as body. Anterior tentacles stumpy, auriculate ; rhinophores 
somewhat longer, excavated and auriculate; mouth a longitudinal 
slit; eyes placed laterally before the rhinophores. Foot obtuse in 
front, with two lobes, generally running out acutely. Sole with a 
median longitudinal furrow. Body as if inflated, having the dor- 
sal opening somewhat in front of the middle, the pleuropodial lobes 
capable of being overlapped across it; when separated widely they 
raise up like a lid (fig. 14). Through this opening water is drawn 
to the gills, and rhythmically (every 5 seconds) expelled again. 
The conic elevations on the back and sides can be depressed. 
Color transparent yellowish-white, marbled and punctate with 
brownish-yellow or yellowish-brown. Many specimens are green- 
ish-gray with olive-green flecks. Sole bluish, without markings. 
Entire upper surface punctate with white, most densely so on the 
conic protuberances, which are clear yellow in many specimens. 
(Mts.). 
Mauritius, in about 2 metres. 
Notarchus . . . . . . Cuvier, Regne Anim. ii, 1817, p. 398, 
pl. 11,f. 1.—N. indicus ScuwErccER, Handbuch der Naturgeschichte 
der skelettlosen ungegliederten Thiere, 1820, p. 745 (based solely on 
Cuvier’s work cited above).—M Arrens in Mobius’ Beitr. zur Meeres- 
fauna Maurit., p.307, pl. 21, f. 4.—N. euvieri Buarnv., Dict.Se. Nat., 
xxxv, p. 161; Man.de Malacol., p. 473, pl. 48, f. 7 (1825).—Aplysia 
gelatinosa Rana, Hist. Nat. Aplys., p. 70,:pl. 23, f. 1-5—_Quoy & 
Gaim., Zool. Astrol., p. 312, pl. 24, f. 8, 4.—Desu., Traite Elem. 
Conchyl., pl. 92, f. 8-10. 
