1881.] THE SURVEY OF H. M.S. 'alert. 75 



Dana, from the Straits of Da Fuca, Oregon, the rostrum is y-toothed, 

 and in the P. danm of Stimpson from Puget Sound, California, 

 -^ 3-toothed; in Pandalus franciscorum, Kingsley, also a Californian 

 species, -j5y- 2-3-toothed, and in P. gurneyi, Stimpson, ?^-toothed. 

 In most of the species of the genus the teeth are much more nume- 

 rous. In one species, however, the P. leptorhynchus of Stimpson 

 (tlie only one, so far as I am aware, besides P. paucidens, described 

 from the Southern hemisphere) the rostrum is only ^^-toothed ; its 

 habitat is Port Jackson, in Australia. 



Stomatopoda. 



Squilla gracilipes, sp. n. (Plate VII. fig. 8.) 



I designate by the above name a specimen (young male) from 

 the west coast of Patagonia, which is allied in nearly all its characters 

 to Squilla armata, but is distinguished by the more numerous spines 

 of the dactyli of the raptorial limbs (which are ten in number), the 

 obsolescence of the median and submediaii and faint definition of the 

 lateral carinse of the first to sixth postabdomhial segments, and the 

 form of the terminal segment, which is as long as broad, smooth on 

 its upper surface, with the median carina less distinctly marked, and 

 with about 26 denticles between the submedian marginal spines 

 and al)out 18 on each side between these and the first lateral spines. 

 The outer spine of the distal prolongation of the base of the uropoda 

 is relatively much shorter than in S. armata. Length 3^ inches. 



PsEUDOSaUILLA LESSONIl. 



Squilla cerisii, Guerin, Voy. Coquille, Crust, p. 40, pi. iv. fio-. i 

 (1830), 5. lessonii on plate. 



Squilla spinifrons, Owen, Proc. Zool. Soc. p. 6 (1832). 



Squilla lessonii, M. -Edwards, Hist. Nat. Cr. ii. p. 527 (1837); 

 White. List Crust. Brit. Mus. p. 84 (1847). 



Squilla monoceros, M. -Edwards, Hist. Nat. Crust, ii. p. 526 

 (1837) ; Gay, Hist. Chile, Zool. iii. Cr. p. 224 (1849). 



Pseudosqtiilla lessonii, Dana, Cr. U.S. Expl, Exp. xiii. i. p. 622 

 (1852) ; Miers, Ann. & Mag. Nat. Hist. (ser. 5) v. p. 113 (1880). 



Pseudosquilla marmorata, Lockington, Pr. Cal. Ac. Sci. p. 33 

 (1877). 



A male and female were collected at Coquimbo. 



Anisopoda. 



Arcturus coppiNGERi, sp. n. (Plate VII. fig. 9.) 



The body is robust, and broadest at the fourth thoracic segment, 

 and is everywhere covered with close-set granules. Head with the 

 anterior margin deeply excavated. The median portion of each of 

 the thoracic segments is elevated, and forms a transverse ridge ex- 

 tending to the lateral margins of the segment ; the ridge so formed 

 is narrowest in the middle, but at the lateral margins covers nearly the 



