Cutaneous Glands in the Terrestrial Tsopoda. 221 
viscous fluid, which has a disagreeable odour and which is 
probably protective. 
SUMMARY AND CoNCLUSION. 
1. In this preliminary study we have satisfied ourselves 
that the Cutaneous Glands, first described by Lereboullet, 
are present in a large number of genera and_ species of 
Terrestrial Tsopoda. 
2. That they are glandular, segmentally arranged organs, 
differing slightly in position and number according to the 
genus or species. 
3. In Porcellio dilatatus there are glands present in all the 
seven mesosomatic segments, which open to the surface by 
fine canals on the borders of the pleural plates. In the 
metasome they are present in segments (3 ?), 4, and 5 and in 
the uropoda. 
4. In all cases they are agglomerated unicellular bodies 
with three nuclei, aud lead into fine excretory canals which 
open on to the surface of the body. 
5. The early stages and development are here described 
for the first time. , 
6. They are probably protective in function. 
BiBLioGRAPHY. 
(1) CoLttince, WALTER E.—“On the Oral Appendages of certain 
Species of Marine Isopoda.” Journ. Linn. Soe., Zool. 1918, 
pp. 65-93, pls. vii.—ix. 
(2) Huet, 1.— Sur l’existence d’organes segmentaires chez certains 
Crustacés Isopodes.” Compt. Rendus, 1882. 
(3) Hunt, L. “Nouvelles recherches sur les Crustacés Isopodes.’ 
Journ. l’Anat, et Physiol. 1883, pp. 241-376, pls. xii.-xv. 
(4) Ipr, Maniiixz.-—Glandes Cutanées a canaux intracellulaires chez 
les Crustacés Edriophthalmes.” La Cellule, 1891, vii. pp. 845- 
374, pls. 1., il. 
(5) Lerrpoutter, A.—‘ Mémoire sur les Crustacés de la famille des 
Cloportides,” etc. Mem. Soc. Nat. Hist. Strasb. 1858, iv. 
pp. 1-130, pls. i.—x. f 
(6) Luypia, F.—‘ Untersuchungen zur Anatomie u. Histologie d. 
Thiere.’ Bonn, 1885. 
(7) Nepesx1, O.—“ Beitriige zur Kenntniss der Amphipoden d. Adria.” 
Arb. zool. Inst. Wien, 1880, pl. vill. 
($) Veruorrr, K. W.—“ Uber Isopoden. Zur Kenntnis der Porcelli- © 
onides.” SB. Gesellseh. nat. Fr. 1907, pp. 229-281. 
(g) Weser, Max.—“ Anatomisches tiber Trichonisciden,” Arch. Mikr, 
Anat. 1881, xix. pp. 579-648, T. 28, 29. 
