236 



3 subfamilies, Galatheines (including Henderson's Porcellanodea), Diptycines, and 

 Aegleines (for the S. American freshwater form Aeglea). 



Ortmann adopts the group Galatheidea, which following Milne Edwards 

 and Bouvier he divides into 4 sections which he ranks as families, Aeylaeidss, 

 Chirostylidx (=Diptycins of Milne Edwards and Bouvier), Galalheidse, and 

 Pwcdlanidx, which seems to me to be a very sensible course, and it is followed 

 here. 



Only two of Ortmann's families, the Galatheidge and the Uroptychidse (= 

 ChirostylidsR) are, so far as is known, represented in the depths of these seas ; 

 the following is a synopsis of their distinctive characters. 



Synopsis of the families of Galatheidea of the Indian Benthos and Oligobenthos. 



I. The telson, which is not folded benenth the preceding abdominal somites, 

 is distinctly made up of plates which suggest a tergum and a pair of 

 appendages modified : the last thoracic sternum is narrow, but well 

 formed: the antennal peduncle appears to be four-jointed, the 2nd and 

 3rd joints being united : the incisor edge of the mandible is entire : a 

 foliaceous epipodite is present on tlie 1st maxillipeds, and a flagelliform 

 epipodite is almost always present on the external maxillipeds ... GALATHEIDJI. 



II. The telson, which is transversely fissured, is, along with the caudal 

 swimmerets, folded beneath the preceding abdominal somites : the last 

 thoracic sternum is more or less atrophied : the antennal peduncle is 

 five-jointed, the 3rd joint being quite distinct from the 2nd : the incisor 

 edge of the mandible is serrated : no epipodites on any of the maxilli- 

 peds ... ... ... ... ... ... UROPTYCHID*. 



Family Gdldtheidce, Dana. 



Oalatheidss, Dana, U. S. Expl. Exp., pt. II. p. 1431 : Henderson Challenger Anomura, p. H6 (pnrt) : Stebbing, 

 Hist. Crust, p. 175 (part) : Ortmann in Bronn's Thier Reich Malacostracn, p. 1150. 



OalntMens, Milne Edwards and Bouvier, Ann. Sci. Nat., Zool. (7) XVI. 1894, pp. 245, 312-313. 



Carapace longer than broad, with the lateral borders well defined and the 

 antero-lateral angles accented, its dorsum usually ornamented with transvei-se 

 ridges or squamous tubercles, the regions usually well defined. Thoracic sternum 

 broad, the independent last segment being distinct. 



Rostrum well developed. 



Abdomen simply folded on itself at the level of the 4th and 5th somites, the 

 large symmetrical tail-fan not being in any way tucked up or concealed beneath 

 the preceding somites. TliG 1st somite is almost completely hidden beneath the 

 carapace. The pleura behind the 1st somite are well developed. 



Eyestalks short : no orbits. Antennular peduncles loosely flexed, but not in 

 any way concealed by fossa3, the basal joint, though shorter and much broader 



