new and rare Crustacea from Scotland. 141 



Stenhelia dispar*, sp. n. (PI. VIII. figs. 8-12.) 



Length *55 millirn. (jV of an inch). Rostrum prominent. 

 Anterior antennse eight-jointed ; the first four joints are robust, 

 the next three are small, and the last is comparatively long 

 and narrow, being equal to the combined lengths of two pre- 

 ceding joints. The formula shows tlie proportional lengths 

 of the joints — 



1~2 3 4 5 6 7 8 * 



The secondary branch of the posterior antenna is three-jointed, 

 the first being nearly equal to twice the combined lengths of 

 the other two. The mouth-organs are nearly as in Stenhelia 

 ima, Brady. The first four pairs of swimming-feet also 

 somewhat resemble those of that species. The fifth pair are 

 broadly foliaceous, like those of Stenhelia kispida, Brady, but 

 the distance between the various setjB with which they are 

 furnished is greater in Stenhelia dispar. Abdomen and 

 caudal stylets nearly as in Stenhelia ima. 



Hob. Vicinity of the Bass Rock, Firth of Forth, dredged 

 in 23 fathoms ; bottom sand and gravel. 



Remarks. Stenhelia dispar appears to be intermediate 

 between Stenhelia ima and Stenhelia hispida ; it resembles 

 Stenhelia ima in the form of the first four pairs of swimming- 

 feet and Stenhelia hispida in the form of the fifth pair, but 

 differs from both in the structure of the anterior antennse. 



Cletodes irrasa t, sp. n. (PI. VIII. figs. 13-17.) 



Length '8 millim. (^V of ^^ inch). Body elongate-cylin- 

 drical, all its segments except the first furnished with a trans- 

 verse fringe of small hairs a little in front of the posterior 

 margin. Anterior antennse stout and sparingly setiferous, 

 shorter than the first body-segment, six-jointed ; the second 

 and last joints are longer than any of the others, while the 

 fifth joint is very small, as shown by the formula — 



20 . 26 . 20 ■ 10 ■ 3 . 24 

 12 3 4 5 6' 



Posterior antennse three-jointed, the first and second joints 

 are nearly of equal length and about one and a half times 

 the length of the next ; a very small secondary branch bearing 



* Dispar, ditlerent, i. e, from any known species. 

 t Irrasus, unshaven. 



