172 



Occurrence. I have met with this form rather abundantly in several 

 places, both off the south and west coasts of Norway, and northwards to the 

 Trondhjemsfjord. It is a more pronounced deep-water species than A. Jcevigata, 

 occurring only in depths varying from 50 to 150 fathoms, muddy bottom. 

 Out of Norway, it has not yet been recorded. 



6. Ampelisca macrocephala, Lilljeborg. 



(PI. 60, flg. 1). 

 Ampelisca macrocephala, Lilljeborg, Ofvers. af Kgl. Vet. Akacl. Forhandl. 1852, p. 7. 



Cephalon fully as long as the 3 anterior segments of mesosome com- 

 bined, and gradually tapering anteriorly, frontal part rather produced, and 

 obliquely truncated at the tip. First pair of coxal plates but slightly expan- 

 ded distally, and scarcely broader than the 2 succeeding ones; 4th pair much 

 more deep than broad, with the lower edge considerably shorter than the hind 

 margin. Last pair of epimeral plates of metasome produced at the lateral 

 corners to a strong spiniform projection, posterior edge forming a rounded 

 lobe in the middle. First segment of urosome having dorsally a slight trans- 

 verse depression, more distinct in the male, and behind it a low carina ter- 

 minating with a slightly projecting angle. Corneal lenses very small, though 

 distinct, the lower pair occupying the inferior corners of the front; underlying 

 pigment somewhat irregular in form and bright red. Superior antennae in 

 female about the length of the cephalon and the 2 anterior segments of meso- 

 some combined, and reaching to the end of the peduncle of the inferior ones, 

 flagellum twice the length of the peduncle, and composed of about 12 arti- 

 culations; those in male, as usual, more elongated and slender, reaching con- 

 siderably beyond the peduncle of the inferior ones. The latter in female 

 scarcely exceeding half the length of the body, last joint of the peduncle 

 shorter than the penultimate one. (rnathopoda rather slender and feeble, 

 propodos of the anterior ones about the length of the carpus, and very slightly 

 dilated in its outer part, that of the posterior ones very narrow, and scarcely 

 half as long as the carpus. Dactylus of the anterior pairs of pereiopoda 

 about the length of the 2 preceding joints combined. Last pair of pereiopoda 

 with the basal joint about equalling in length the remaining part of the leg, 

 posterior expansion rather broad, and transversely truncated at the tip, ischial 

 joint short, meral joint forming at the end posteriorly a rather small, deflexed 

 lobe, fringed with delicate setae, carpal joint heart-shaped, with 3 long ciliated 

 setse originating from the posterior corner, propodal joint oblong, tapering 

 distally, and scarcely longer than the 2 preceding joints combined, dactylus 

 about half its length. Last pair of uropoda with the rami broadly lanceolate, 



