146 



form, which was unknown to Prof. Brady, as also the form named by Boeck 

 I )i<^u,-i-iifi iilii/^i, belong- to the genus Aini>lii<t*cn*. recently established by the pre- 

 sent author. Tin- -THUS /)i<,sii<-r<is. in the restriction here adopted, differs con- 

 -piciumsly from the other '2 genera included in the present family, both in 

 external appearance and in several of the anatomical characters. In addition to 

 the typical form, another nearly-allied, though evidently distinct species has been 

 described by Th. Scott as Dt<>*n-n* i>r<>i>'tn<irns. Only tlie type species has as yet 

 been found off the Norwegian coast. 



in.'. Diosaceus tenuieornis (Hans). 



(I'l. LXXX1X i XC). 



f ><i,'ti/li>j>iix tr)n<ii-tii-ni*. Clnus Die tVcili'liendrn ( 'Mpr|i<><lttii, p. 1^7, JM. XVI, !ii;s. 17 23. 



N/yrr/'/'V ('hnr<i<-tfi-*. I'^'nnilc. Body moderately robust, with the anterior 

 division considerably broader than the posterior. Cephalic segment more than 

 twice as long as all the free segments of metasome combined, and evenly vaulted 

 above; epimeral parts very fully developed and much curved in the middle. 

 embracing between them the oral parts, only the posterior maxillipeds projecting 

 beyond their edge-. Rostrum somewhat lamellar and very prominent, being 

 slightly curved. Kpimeral plates of the ',} succeeding segments of moderate si/e, 

 delh-xed and angular behind. Last segment of metasome narrower than the pre- 

 ceding ones, and without distinct epimeral plates. Urosome scarcely more than 

 half the length of the anterior division, and rapidly tapering behind; genital seg- 

 ment considerably dilated in front, and divided in the middle by a somewhat 

 curved transverse line: last caudal segment longer than the preceding one. Caudal 

 rami closely juxtaposed and somewhat applanated. being slightly longer than they 

 are broad at the base, miter edge armed with a short spine beyond the middle. 

 apical M't;e -carcely diverging at all. the innermost but one much the longe-t. 

 Anterior antenna 1 unusually slender, with the joints of the proximal part nm- 

 -iderahly prolonged, the 2nd joint being the largest, terminal part not nearly 

 attaining half (lie length of the proximal part. 1'osterior antenna' likewise rather 

 Blender, witli the terminal joint long and narrow, outer ranius not nearly half as 

 hmg as tin- latter, and pro\ided with I seta 1 . 2 apical and 2 lateral. I 'ostcrior 

 maxillipeds \\ith the hand \cr\ large and deeply concaved inside, dactylus strong 

 and curved. 1st pair of legs rather slender, rami very unequal, the outer one 

 scarcely more than half as long as the inner, last joint somewhat shorter than 

 the other -2. and provided with :! spines successively increasing in length, and a 



