458 iMv. L. A. Borradaile on the 



but a fuller treatment of them may be found in the orlglna 

 papers *, especially those in the ' Fauna of the Maldives.' 



I. 



The true position of the order Decapoda in the Crustacean 

 system is very well shown by Dr. Caiman's elaboration of 

 Hansen's classification, published in this Journal in li'04 f. 

 To this classification 1 would give my adhesion, only pointing 

 out that, if the Crustacea be given rank as a subphylum of 

 the Arthropoda, equivalent to the Arachnoidea, Tracheata, 

 and Prototracheata, the Malacostraca become a class and the 

 Eumalacostraca a subclass. 



For our present purposes the most important of the points 

 made by Dr. Caiman is the close relationship between the 

 Euphausiacea and the Decapoda. We shall assume that the 

 two orders have a common origin and regard the subdivisions 

 of the Decapoda as primitive in proportion as they approach 

 the Euphausiacea, though it will at the same time be necessary 

 to bear in mind that the Decapods with four rows of gills, 

 representing, as we shall see, both epipodite and proepipodite, 

 cannot be descended from the modern Euphausiaceans, which 

 have only one row. 



* " A Revision of the Pontoniidoe," Ann. & Mag. Nat. Hist. (7) ii. 

 pp. 376-391 (1898). [History, affinities, and limits of the (sub-) family, 

 pp. 376-379.] 



" On the Stomatopoda and Macrura brought by Dr. Willey from the 

 South Seas," Willey's Zool. Eesults, iv. pp. 395-428, pis. xxxvi.-xxxix. 

 (1900). [PalcF.monopsis, a Palsemonid with affinities to Poutoniidse, p. 410 ; 

 doubtful validity of Latreutidge, p. 414.] 



" On some Crustaceans from the South Pacific. — Part IV. The Crabs," 

 Proc. Zool. Soc. 1900, pp. 508-596, pis. xl.-xlii. [Primary subdivisions 

 of the Crabs, p. 571 ; subfamilies of Atelecyclidfe, Cancridse, and Por- 

 tunidse, pp. 575-577.] 



" Marine Crustaceans " in Gardiner's ' Fauna and Geography of the 

 Mai dive and Laccadive Archipelagoes.' — Part III. The Xanthidfe and 

 some other Crabs, vol. i. pp. 237-271, text-figs. 41-60. [Characters and 

 Classification of Xanthidse, pp. 237-238.] — Part IV. Some Remarks on 

 the Clarification of the Crabs, vol. i. pp. 424-429, text-fig. 110.— Part VI. 

 The Satfl-Crabs (Oxystoniata), vol. i. pp. 434-439, text-figs. 115-117, 

 pi. xxii. [Characters and Classification of Oxystomata, p. 434.] — Part IX. 

 The Sponge-Crabs (Dromiacea), vol. ii. pp. 574-578, pi. xxxviii. [Cha- 

 racters and classification of Dromiacea, pp. 574-576.] — Part X. The 

 Spider-Crabs (Oxyrhyncha), vol. ii. pp. 081-690, text-figs. 122-126, 

 pi. xlvii. [Characters and classification of Oxyrhyncha, pp. 681, 682.] — 

 Part XI. On the Classification and Genealogy of the Reptant Decapods, 

 vol. ii. pp. 690-698, text-figs. 125, 126, pi. xlviii.— Part XIII. The 

 Hippidea, Thalassiuidea, and Sc^dlaridea, vol. ii. pp. 750-754, pi. Iviii. 

 [Characters and classification of the groups.] 



" On the Classification of the Thalassiuidea," Ann. & Mag. Nat. Hist. 

 (7) xii. pp. 534-551 (1903). 



t Ann. & Mag. Hist. (7) xiii. p. 144 (1904). 



