298 GEOMALACUS MACULOSUS. 
uncovered upon the rocks amongst the dark-grey lichens, whose white 
and yellowish fructifications conceal the slug perfectly, and is a striking 
instance of protective coloration,’ as they so closely resemble clumps of 
moss or lichens. ‘he discoverer, Mr. W. Andrews, especially remarked 
Fic. 273.—Geomalacus maculosus var. fasciata at rest on the lichen-covered rocks of Cloonee, 
showing their protective resemblance to their environment (photo. by Mr. R. Welch). 
upon finding specimens aiid the tufts of Zylocomium splendens and Oscil- 
latoria friesii, which abound in masses at the shaded base of the moist 
rocks at Oulough. In times of drought, in favourable localities they swarm 
out of their damp retreats before sunset to feed, their tentacles being then 
only partially protruded, they disappear again soon after sunrise, burrowing 
1 Mr. David McArdle, of the Royal Botanic Gardens, Glasnevin, Dublin, has kindly furnished me with 
the following list of the more prevalent Hepatics, Lichens, and Mosses, found in the area inhabited by 
Geomalacus, the publication of which it is hoped will lead to the discovery of the special food plants, and 
to the identification of the plant or plants to whose similarity it owes its protective resemblance. 
The LicHens are very generally distributed, but Lefsfogium tremelloides 1. is partial to old wood 
banks, rocks, etc. ; Parmelia saxatilis to old walls and rocks; Cladonia rangiferina L., C. cervicornis 
Ach., and C. cocct/era LL. to heath or peat and rock-crevices; Usnea barbata Fries is found on branches 
and trunks of trees and affords much shelter; while Pedtigera canina L. and Sticta pulmonacea Ach. 
grow in clumps on rocks and damp banks. 
The Heparics are apparently more local. 
Kantia trichomanis L., and Cephalosia bicuspidata \.. being found on rocks and banks about 
haven. Setween the Tunnel and Glengariff, arsupella emarginata Ehrh., Nardia scalaris Schrad., 
Pellia epiphylla \.., P. calycina Taylor, Conocephalus conicus Nech., Metzgeria furcata L., Frullania 
dilatata L., and /. tamarisei L. are the prevalent species ; while on old walls and banks about Kenmare 
and Cloonee are Plagiochila asplenioides L. and P. spinulosa Dicks, Marchantia polymorpha L., Lunu- 
laria cruciata L., and large patches of Lejeunea serpyllifolia Dicks, with Trichocolea tomentella Ehrh., 
Lepidozia reptans L., Lophocolea bidentata L., and L. cuspidata Limpr. 
The Mosses are also localized: Homalia trichomanoides Hedw., with Neckera crispa Hedw., occur 
in large patches on the trunks of trees, while Bvachythecium velutinum B. & S., Campylopus, atrovirens 
De Not., Hylocomium loreum B. & S., and H. splendens B. & S., are found on the mountain sides and 
old walls and logs between Kenmare and Cloodnee. Between the Tunnel and Glengariff, Breutelia 
chrysocomr Lindb., Canpylopus fiexuosus Bril., Dicranum scoprrinum Hedw., Hylocomium triquetrum 
B. & S., Porotrichum alopecurun Mitt., Climacium dentroides W. & M., Plagiothecium undulatum 
B. & S., P. borrerianum Spruce, Hypnum cupressiforme L., and its var. A/iformez occur; while 
common and generally distributed about Berehaven are Camtsylopus fragilis B. & S., Burtramia 
pomiformis Hedw., Dicranum bonjeant De Not., and IVeissia rupestris C.M.; Bryum pseudotri- 
quetrum Schwere. occurs in large masses about heaths and rocks, B. alpinum Huls., and Ptychomitrium 
polyphyllum Firn. on rocks, and Racomitrium lanuginosum Brid. on rocky banks. 
Scapania resupinata L., Diplophyvliium albicans L., 
Jere- 
