1 1' 



though a little larger than the rostral teeth; the tip of the anterior tooth is 1,5 mm. distant 

 from the anterior border of the carapace, a little more than one-fourth its length and also 

 1,5 mm. from the tip of the posterior tooth, which is situated a short way behind the middle 

 of the carapace. The anterior tooth is just as far distant from the i«' rostral tooth as the latter 

 from the 4'^ and a line uniting the tips of all the teeth curves slightly downward. Short spiniform 

 setae are implanted close to the upper margin of the two teeth that stand on the carapace 

 and two or three very long setae of the usual form near their tips. 



Orbital angle obtuse. Hepatic spine small, situated at the level of the upper margin of 

 the basal joint of the outer antennae. Branchiostegal groove, beneath the hepatic spine, horizontal, 

 rather deep, not yet reaching to the level of the tip of the cardiac tooth. The abdomen 

 resembles that of Sic. parvti/a- it is solely the carina of the i^' tergum that is produced into 

 a sharp tooth and the anterior portion of the pleura of the i^' somite is flattened, without any 

 trace of a groove. The longitudinal ridges on the posterior part of the terga are little prominent. 

 There is a small tooth at the posterior angle of the 4"^ pleura, but a spine at those of the 

 5"^ and the 6"'. 



Eyes large, flattened above, a little shorter than the rostrum. As regards the two pairs 

 of antennae and the other thoracic appendages, this species resembles Sic. parvula. 



753. Sicyonia parvttla de Haan. 



Sicyonia parvula de Haan, Fauna Japon. Crust. 1849, p. 195, Tab. XLV, Fig. 6. 



Stat. 164. August 20. i°42'.5S., I30°47'.5 E. Between Misool and New Guinea. 32 m. Sand, 

 small stones and shells. 8 specimens, males and females, all young. 



Stat. 273. December 23/26. Anchorage oft" Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 

 13 m. Sand and shells, i young specimen. 



Though DE Haan's description is very brief, there can be little doubt that these specimens 

 indeed belong to this species, for they are perfectly well in accordance with the quoted figure. 

 Unfortunately the specimens are all young, the largest individuals measuring 17 mm.; the 

 carapace, rostrum included, is here 6,25 mm. long, but Sic. parvula attains a length of 30 mm. 

 The rostrum that almost reaches to the end of the 2"^ antennular article, is characteristic, as 

 it is in most species of this genus, and rightly defined by the words "rostro sen.sim angustiore". 

 Whereas the rostrum of Sic. laevis appears more than twice as broad at its base than at 

 the tip, that of the present species very little narrows distally : in two specimens from 

 Stat. 164 it is almost one-third broader at the base than at the level of the penultimate tooth 

 of the upper margin, but in the other individuals the difference is still much smaller, and the 

 rostrum appears then barely broader at the base than near the tip; so e.g. in 

 a female long 1 7 mm. the rostrum is 0,48 mm. broad at the base and 0,44 mm. at the level 

 of the penultimate tooth of the upper margin. In all the specimens the upper margin of the 

 rostrum bears 5 teeth, the i*' of which is placed on the carapace, and i tooth just below the 

 spiniform tip, that is curved downward; in a male from Stat. 164 the i''' tooth is more than 

 one and a half as far distant from the 2°'' as the 2^"^ from the 3"^'^ and the distances between 



117 



