Report on the Malacostraca, Pvcnogonida and some Kntomostraca. 521 



If we take it as certain thai the specimen belongs to the genus 

 Spirontocaris, tlie next question is of the species, and tlie only good 

 character for the dermination of this seems to be the spines on the 

 front margin of the carapace. The East Greenland species with 1 

 spine above each eye are S. groenlandica and S. polaris; but because 

 this stage only has 1 spine, it can scarcely be taken for granted, 

 that the adult will not have 2. East Greenland species with 2 

 spines above each eye are S. Lilljeborgi, S. spinas and S. turgida. 

 The specimen may thus belong to one of these 5 species; S. groen- 

 landica must probably be excepted, however, as the epimeral plates 

 on the abdominal segments are not pointed. 



C. Early stage of a Spirontocaris (PI. XLII). 



St. 27. Danmarks Havn, 10—15 fm., 29—9—1906. Delesseria region, 

 soft bottom. 1 spec. Total length 9 mm. 



Carapace almost cylindrical (fig. 21), between 1/3 and l/4th of 

 the total length of the animal. Rostrum very short, without teeth. 

 Above the eye a fairly large spine; below the eye, how^ever, and on 

 the lower, anterior corner of the carapace the spines are just 

 indicated. The 1st and 2nd abdominal segments almost equally 

 long and very nearly of the same length as the 4th and 5th seg- 

 ments. The 3rd segment in the dorsal mid-line is twice as long as 

 the other segments and is greatly drawn out posteriorly. The epi- 

 meral plates on the 1st — 5th segments rounded. The 6th segment 

 twice as long as the preceding, almost cylindrical. The telson 

 (fig. 30) of equal length with the 6th segment, with slightly convex 

 sides and at the tip about 1^'з times as broad as at the base. On 

 each side close to the hinder corner is a small spine; on each 

 corner 1 somewhat larger and on the posterior edge 3 pairs of con- 

 siderably larger spines; there is a comparatively great distance 

 between the outermost and the next pair of spines. 



The eyes (fig. 22) have almost the same form as in the stages A 

 and В (figs. 2 and 12). 



The squama (fig. 22) has almost the same form as in the stage 

 A (fig. 2), but the front edge is somewhat more evenly cut, so that 

 the teeth come to project more forwards. The portion of the fla- 

 gellum preserved is formed of quite distinct joints. 



In the 2nd pair of antenna (fig. 22) the outer edge of the first 

 2 joints of the stalk ends in a tooth. The endopodite short, three- 

 jointed; the exopodite somewhat longer, six-jointed. 



The mandibles (fig. 23) want the palps. Of the mastigatory part 

 the end of the cutting part has 2 large proximally to them 2 quite 

 small teeth. The molar process is a little longer and along the edge 



