52 



angular at the tip, the angle being more prominent in young specimens; 

 enclosed ova very numerous and densely accumulated. Tail not nearly attaining 

 half the length of the anterior division, and slightly tapered distally; last 

 segment rather short and remarkably produced at the end both dorsally and 

 ventrally. Caudal rami of rather a peculiar appearance, forming 2 somewhat 

 claw-like and very mobile lamellae curving downwards, each armed at the 

 narrowly exerted tip with a stout spine accompanied by 2 or 3 smaller den- 

 ticles. Anterior antennas comparatively short and stout, being only composed 

 of 7 joints clothed with rather small curved setae, the first 2 joints very large 

 and expanded, occupying combined 2 /3 of the length of the antenna. Posterior 

 antennae strongly chitinised, with the terminal joint comparatively short, not 

 even attaining the length of the middle one. Endopodal part of maxillae with 

 3 somewhat unequal setae inside the base; terminal joint extending straight 

 outwards, and fringed on the inner edge with 4 very small setae, at the some- 

 what exerted knob-like tip with 3 considerably longer setae. Posterior 

 maxillipeds rather fully developed, 'with all the joints setiferous, the last one 

 exhibiting traces of a subdivision. 1st pair of legs with the rami nearly 

 equal-sized, the 3 succeeding pairs however having the outer ramus consider- 

 ably larger than the inner, with most of the setae obliterated and replaced by 

 tufts of small spinules. Last pair of legs with the distal joint cultriform, and 

 armed on the inner edge with small denticles. 



Body in the living animal of a whitish gray hue, with the ripe ova dark 

 fuscous green. 



Length of adult female attaining 5.00 mm. 



Remarks. This is much the largest of the known Doropygidae, and 

 moreover easily recognisable by its unusually robuste body. The male of 

 this species has been well described and figured by Canu. 



Occurrence. I have met with this form occasionally in several places, 

 both on the south and west coasts of Norway. It is found in several kinds 

 of Ascidians, most frequently perhaps in Phallusia mentula. The mobility 

 of the living animal is very restricted. 



Distribution. Coast of Bohuslan (Thorell), British Isles (Norman, Scott), 

 coast of France (Canu), Mediterranean (Buchholtz). 



Gen. 7. Notopterophorus, Costa, 1852. 



Generic Characters. Body of female strongly curved ventrally, with the 

 free segments of trunk sharply defined and produced dorsally to more or less 



