132 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Other from the Spanish island of Annobon (Anno Bom) in the Gulf 

 of Guinea. 



The discovery of C. bradyi in the Galapagos is closely paralleled by 

 that of the hydroid, Streptocaulus pulcherrimus Allman, in the same 

 archipelago by Fraser in the course of the same Hancock Expedition, 

 1934. The type locality of the hydroid, like that of the stomatopod, lies 

 in the Cape Verde Islands. This coincidental distribution has also been 

 referred to on page 202 under C. bradyi. 



ZOOGEOGRAPHIC NOTES* 



Twenty-one (+ one subspecies) of the 28 (+ one subspecies) species 

 of stomatopods recorded from the eastern Pacific are known from that 

 region only.^ 



Of the remaining 7 species : 3, Squilla armata, Pseudosquilla oculata, 

 and Lysiosquilla maculata^ occur in the Atlantic, as well as in the 

 Indo-Pacific ( Indo-west-Pacific, Ekman''') ; 3 others, Squilla dubia, Coro- 

 nida bradyi, and Gonodactylus oerstedii, are found in the Atlantic but 

 not in the Indo-Pacific ; and one, Hemisquilla stylifera, is otherwise found 

 in the Indo-Pacific from New South Wales, Australia, only.^ 



In his discussion of Gonodactylus oerstedii and its varieties, Bigelow^ 

 states, "It is not surprising to find the same species of similar forms with 

 slight differences on the two sides of the Isthmus of Panama, a land 

 barrier that arose during the upper Miocene Period.^^ Similar results 

 were obtained from the study of the species of Squilla (Bigelow, 1894^^). 

 Squilla intermedia is an Atlantic form, and two closely related species, 

 S. panamensis and S. biformis, are probably entirely confined to the 

 Pacific Coast of America (cf. Caiman, 1917, p. HO^^). The wide stretch 



4 See also Balss, Bronns Klassen und Ordnungen des Tierreichs, Vol. 5, Abt. 1, 

 Book 6, Pt. 2, Stomatopoda, p. 127, 1938. 



5 The 28 (+ one subspecies) species are enumerated on pages 130-131. 



6 The occurrence of the species proper in the Atlantic should be corroborated ; 

 however, the variety sulcirostris is reported by Monod (see p. 192). 



7 Tiergeographie des Meeres, pp. xii + 542, Leipzig, 1935. 



8 There is also an old, but as yet uncorroborated, record of this species from 

 the Hawaiian Islands. 



9 Bull. Mus. Comp. Zool., Vol. 72, No. 4, p. 122, 1931. 



10 "There may have been a narrow connection between the Atlantic and the 

 Gulf of California during the Pliocene." Vaughan, U.S. Nat. Mus. Bull. 103, 

 p. 611, 1919. 



11 Proc. U.S. Nat. Mus., Vol. 17, No. 1017, pp. 509-543. 



12 Brit. Antarct. ("Terra Nova") Exped., Nat. Hist. Rep., Zool., Vol. 3, No. 5, 

 1910. 



