Bdmondsou — Stomafof^oda in the Bisho/^ Miiscinu 283 



In all Squillidae this complicated organ is borne on the termi- 

 nal segment of the endopodite of the tirst abdominal appendage and 

 consists of three distinct portions : first, the retinacnlnm or ex- 

 ternal api;endicular ])rocess (nil — fig-, i, a-c and i;), which is 

 medial in posititm, ronnded proximally and pointed distallv. with a 

 flattened medial surface provided with rows of hooked spines which 

 interconnect with those of the corresponding- org;an of the opposite 

 appendage: second, the movable limb ( ;/// — fig-, i, a-c and «■ ) of the 

 forceps of the organ, which projects at an angle across the surface 

 of the endopodite. its free end, in most species, slightly curved and 

 spoon-sha])ed : third, the fixed limb of the forceps (il — fig. i, a-e 

 and i^), which also extends at an angle across the endopodite and, 

 in most species, terminates in a hook. 



Brooks-, ]!orradaile-\ Chilton\ and others have figured and 

 described the accessory organs of certain species of Squillidae. 

 The characteristic features of the structure in additional species are 

 presented in this report. 



Although the Squillidae are known to inhal)it the tropical, 

 subtropical, and temperate oceans, yet the greater number of them 

 have been taken from the warmer seas. Some are apparently 

 localized in their distribution or at least have not been reported 

 from widely separated regions, and others within certain latitudinal 

 limits are extensively dispersed throughout the Indian, Pacific, and 

 Atlantic Dceans. 



A number of species of Squillidae are known to range con- 

 siderably below the 100- fathom line. Bigelow reports Squilla 

 bifoniiis as having been taken in Panama Bay at 85-259 fathoms, 

 and the "Investigator" took Squilla Icptosqiiilla in the Indian 

 Ocean at 370-419 fathoms. The larger number of known species 

 are, however, confined to shallow water where they burrow in 

 the sand or conceal themselves in the crevices of dead coral. 



'Brooks, W. K.: Op. cit., Pis. i. 2, 10. 15, 1886. 



" Borradaile, L. A., On some crustaceans from the South Pacific, 

 Part I, Stomatopoda : Proc. Zool. Soc. London, Pis. 5, 6, 1898. 



^Chilton, C, Notes on the New Zealand Squillidae: Trans. New 

 Zealand Inst., vol. 23. pi. 10, i8go; Revision of the New Zealand Stomato- 

 poda: Trans. New Zealand Inst, vol. 43, p. 136, tig. 2, igio. 



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