Kjrkpatrick — Hydroida and Polyzoa, Torres Straits. 613 

 Total species and varieties of Polyzoa from Torres Straits, 77 : — 



Chixostomata, 66 species. j Cte^ostomata, 6 species. 

 Cyclostomata, 4 species. | Pedicellinea, 1 species. 



Professor Haddon's collection contains four new species, and 

 four new varieties, viz. : — 



Bicellaria (Stirparia) haddoni, n. Chorizopora Irongniartii, Audouin ; 



sp. 14. var. spinosa, nov. var. 14. 



Lepralia filamentosa, n. sp. 14. Lepralia occlusa, Busk; var. areo- 



Smittia levis, n. sp. 14. lata, nov. var. 14. 



Barentsia laxa, n. sp. 4. Cellepora discoidea, Busk; var. fru- 



Jlembranipora radicifera, Hincks ; tetosa, nov. var. 3, 8. 



var. intermedia, nov. var. 14. 



With regard to the distribution of Polyzoa, the Torres Straits 

 does not form a limited and defined region, but only the northern 

 part of an intratropical area, extending along the coast of Queens- 

 land, within the Great Barrier Reef. 



Eighteen of the species in the above list are also recorded by 

 Mr. Haswell 1 from Holborn Island, ten degrees of latitude south 

 of Torres Straits. 



Stirparia haddoni, n. sp. 

 (PI. xv., fig. 4.) 



Zoarium forming celliferous caliculate tufts at the ends of 

 jointed corneous stems ; the tufts composed of dichotomous 

 branches, with the zooecia opening on the outer surface. Zooecia 

 biserial, alternate, sub-turbinate, facing towards the centre of the 

 branches, and with the outer margins curved round so as almost to 

 meet along the central line ; aj)erture quadrate with concave lower 

 border ; area occupying about half the front of the cell ; upper 

 borders of zooecia sinuous, and ending in a spinous process at the 

 upper outer angle. 



No spines ; no avicularia. 



Ooecia (?) 



1 " Proc. Linn. Soc. N S. Wales," vol. v., p. 33, 1860. 



