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 off 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 S. 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. 







tiegmentum antennale svpra planum, paulo dblongum, antice rotundatum, 

 laiere externo spind armatum. Oculi parvuli subreniformes, pedunculo 

 subcylindi'ico. Carapax quinque costis ornatus, angulis anticis acutis 

 parce productis. Margines late-rales segmentorum thoracis 3 posti- 

 corum integri, segmento precedente utrinque acuto. Digitus clielce 

 maximce Q-spinosw. Abdomen superficle S-costatum, costis segmen- 

 torum 4 anticorum postice nullis acute productis, segmentorum 5ti Qtique 

 costis lateralilus postice acutis, segmenti Qti totis postice acutis. /Seg- 

 mentum caudate tnedio actite carinatum, superftcie nee sulcatd nee 

 2)unctatd, spinis marginum octo longioribus acutis. inter duos medianas 



