143 



with a thin deflexed lamella issuing from inside the basal part, and terminating 

 in 2 unequal digitiform processes, terminal part somewhat complanate, biarticulate, 

 with the distal joint discoidal and armed outside with 3 slender spines ; right leg 

 very strongly built, with the chela exceedingly large and tumid, both the dactylus 

 and thumb sharply pointed, palmar edge irregularly indented, with an obtuse 

 projection in the middle. 



Colour. Body semipellucid, with a yellowish green tinge, and in female 

 generally with 3 dark yellow transverse patches on the dorsal face of the anterior 

 division; dorsal ocular lenses in male highly refractive. 



Length of adult female 2.40 mm., of male 2.20 mm. 



Remarks. This form was first described by Lubbock as a species of the 

 genus Pontella of Dana. The Pontella helgolandica of Glaus is unquestionably 

 identical with Lubbock's species. It is easily recognized from the 2nd Norwegian 

 Pontellid, Anomalocera Patersoni, though agreeing closely with some of the exotic 

 species of the present genus. 



Occurrence. I have taken this form occasionally at Mserd0, outside Aren- 

 dal, and in the lower part of the Christiania Fjord. Some few specimens were 

 also found in a plankton-sample taken by Dr. Hjort in the Langesund Fjord, 

 and Mr. Nordgaard has observed this form in the neighbourhood of Bergen. Like 

 all the other Pontellidse, it is a true pelagic form, occurring more generally in 

 the open ocean, close to the surface of the sea. 



Distribution. British Isles (Brady), Heligoland (Glaus), coast of France 

 (Canu), Mediterranean (Giesbrecht), Atlantic Ocean, between Lat. 36 and 55 N. 

 (Giesbrecht). 



Fam. 22. Parapontellidae. 



Characters. General form of body somewhat resembling that in the 

 Pontellidw. Cephalosome well defined from the 1st pedigerous segment, front 

 without any rostrum, but carrying below 2 soft tentacular appendages. Last seg- 

 ment of metasome united with the preceding one, and in male conspicuously 

 asymmetrical. Urosome composed in female of 3, in male of 5 segments. Caudal 

 rami in both sexes perfectly symmetrical, with the full number of setae. A small 

 ventral eye present, and moreover a rather large central eye ; no cuticular lenses 



