613 CRUSTACEA. 



slender nerve, just behind the first ganglion ; also, two others, before 

 reaching the second ganglion. The second ganglion consists of six 

 distinct ganglions in close contact, and occupies a position between 

 the five pairs of legs. Each of the component ganglions gives oflf a 

 pair of cords for each of the members below, and the anterior, two 

 pairs which pass to the mouth. There is a ganglion in each of the 

 following segments, excepting the last, as in Astacus ; and from each 

 ganglion but the last, three nerves pass out on either side, one for- 

 ward and outward, one upward, and one backward and outward ; the 

 first is very small, the second the largest. The last ganglion is similar 

 to the same in Astacus. 



This species is near $ scabricauda. 



Genus SQUILLA. 



We restrict the genus Squilla to the species that have the abdomen 

 more or less costate, and the carapax much narrowed anteriorly, with 

 acute anterior angles. The carapax, moreover, is shorter than in Pseu- 

 dosquilla; the body more lax in its articulation; the scale covering the 

 antennary segment much smaller in proportion to the joint; the eyes 

 longer and more salient. 



In De Haan, the species of this division of the genus Squilla are 

 called Mantides (Faun. Japon., p. 221). 



Squilla rubro-lineata. 



tegmentum antennale supra planum, paulo oblongum, antice rotundatum, 

 latere externa spi?id armatum. Oculi parvuli subreniformes, peduncuh 

 subcylindrico. Carapax quinque costis ornatus, angulis anticw acutis 

 parce productis. Margines laterales segmentorum thoracis 3 posti- 

 coram integri, segmento precedents utrinque acuto. Digitus chela: 

 nmximce S-spinosus. Abdomen superficie S-costatum, costis segmen- 

 torum 4 anticorumpostice nullis acute productis, segmentorum 5ti 6tique 

 costw laterahbus postice acutis, segmenti Sti totis postwd acutis teg- 

 mentum caudate medio acute carinatum, superficie nee sulcatd nee 

 punctata spmis marginumocto longioribus acutis, inter duos medianas 



