158 TBOCEEDINGS OF SOCIETIES. 



cinct that I am not quite sure whether this may not be a nondescript 

 species. 



Antrim (W. T.), Dublin (?) 



Palinuru8 vulgaris. — Although rare, there can be no doubt this spe- 

 cies has occurred in Dalkey Sound, and of large size. 



Astacus fluviatilis. — Once, at least, in Bray River ; common in 

 streams about Maynooth, and also formerly taken in the LifTey. I have 

 seen specimens from the following counties : — Longford, Cavan, Tippe- 

 rary, Kildare, Dublin, Kilkenny, Meath. It is probably to be found 

 nearly all through Ireland. 



Crangon fasciatus Of this rare species I met with specimens at 



Sandycove, in the sandy pools, in a zostera bank at extreme low water. 

 Spawns in May. Every one of my specimens shows the broad black 

 band most distinctly. 



Dublin. Bray (R. B.), Galway (A. G. It) 



Hippolyte varians. — This species occurs in great numbers in the 

 sand-pools among the zostera banks at Sandycove, near Kingstown; 

 spawns in May. The specimens vary remarkably and beautifully in 

 colour: pink, red, salmon, emerald-green, cobalt-blue, gray, chocolate- 

 brown, opal white, are among the prevailing tints ; the ova of a choco- 

 late brown. 



It is remarkably sensitive of handling ; in no case could I succeed 

 in keeping it for over forty-eight hours in a tank, although specimens 

 of Crangon fasciatus and My sis chameleon, from the same locality, lived 

 with me for days. A volume might be written on the forms of the beak 

 of this species. I have figured (Plate X.) the best-marked varieties, 

 which occurred in the following proportions : — 



Plate X., Pig. 1 . — a, Normal type ; rostrum nearly straight ; apex 

 bidentate, directed upwards, upper tooth shortest; below two teeth, 

 the anterior much posterior to the upper tooth of apex ; proportional 

 frequency of occurrence, 63 per cent. 



Fig. 2. — I, Rostrum straight ; apex tridentate, teeth directed for- 

 wards, upper and lower teeth nearly equal in length ; below, one tooth 

 only ; proportional frequency, 25 per cent. 



Fig. 3. — c, Rostrum strongly curved upwards, scimitar-shaped; 

 apex tridentate, upper tooth slightly longer than lower ; below, a single 

 tooth ; proportion, 8 per cent. IS. B. The whole animal is much slen- 

 derer than the normal type : query, a species f 



Fig. 4. — d, Rostrum straight ; apex broadly truncated, directed for- 

 wards, quadridentate, apical teeth very minute ; below, two teeth ; pro- 

 portion, 2 per cent. 



Fig. 6. — e, Rostrum straight; apex acuminate, simple, directed 

 upwards ; rostrum with two teeth below. One specimen out of 300 

 examined. 



Fig. 5.—/, Rostrum straight; apex bifid; rostrum with three teeth 

 below, viz., one beneath apex and two closely approximated in the 

 broadest portion of the rostrum. One specimen. 



All these specimens, in addition, have the basal superior tooth (cha- 



