188 Mr Henry Goodsir on a New Oenus, 



joint oblong ovate, produced into a small blunt tooth at its anterior 

 edge ; lower edge armed with two strong spines ; the interspace armed 

 with a number of strong spines ; claw strong ; apodal thoracic segments 

 considerably lengthened, slightly contracted posteriorly. The origin 

 of the branchial lamellse placed behind the middle of the segment. 

 Posterior throacic segments nonpediculated ; legs long, bearing a few 

 bristles ; inferior edge of the last articulation of the last pair of legs 

 armed near the base with a small tooth. 



This species differs from the Caprella Phasma of Colonel 

 -Montague in having five spines on the first thoracic segment, 

 and from the segments of the body being considerably longer. 

 Tlie third joint of the superior antennie is very much longer, 

 and the first pair of feet are also minute and slender, differ- 

 ing in so far from those of Phasma, which are strong and 

 powerful. The inferior edge of the last joint of the second 

 pair of feet is also armed with two strong spines, whereas in 

 the Phasma there is only one strong spine. 



Plate III. Fig. 6. 



2. Caprella tuherculata. — Body robust. Superior antennae almost reach- 

 ing to the first finlet ; fourth joint about half the length of the third ; 

 fifth joint composed of about thirteen articulations. A short spine on 

 the summit of the head almost as long as the post-occipital segment ; 

 swelling of the first thoracic segment exactly in the middle; a short 

 tubercle on the summit. Femoral joint of the same length as the 

 depth of the segment; last joint oval. Four tubercles placed in a 

 square form on the dorsum of the fourth thoracic segment. A spine 

 on the last joint of all the three last legs. Long, f of. an inch. Hab. 

 Frith of Forth. 



Description. — Whole body of an opaque yellow colour. All the joints 

 of the body bearing spines or tubercles on the dorsal surface. Head 

 nearly spherical, with a short sharp spine on its vertex, almost as long 

 as the post-occipital segment. Eye small and spherical. Superior 

 antennae reaching to the middle of the second thoracic segment ; first 

 joint obsolete ; second as long as the head and post-occipital segment 

 conjoined ; third longer ; fourth joint about half as long as the third ; 

 fifth multiarticulate, moniliform, and composed of fourteen articula- 

 tions armed with spines on their lower edge. Inferior antennse reach- 

 ing to the middle of the fifth joint of tlie superior antennse ; two first 

 joints together equal in length to the half of the third, fourth, and fifth 

 of the same length ; last joint armed with a claw. Eyes small, black. 

 Post-occipital segment a very little longer than the head, and bearing 

 two blunt tubercles at each extremity. First thoracic segment twice 

 as long, swelling very little, and situated in the middle ; a blunt short 



