Gatty Marine Laboratory, St. Andrews. 165 
Spirorbis, and there is also doubt concerning Vermilia and 
the two species of Ditrypa aud Hydroides. 
Claparéde * (1868) includes nine Serpulids in his Nea- 
politan Polychets, and they are spread over nine genera, of 
which Psygmobranchus alone has two species. 
Grube + (1877) records only two species in the extensive 
collections of the German ship ‘ Gazelle, viz. a Serpula 
and a Pomatoceros. In his Philippine Annelids seven 
Serpulids are entered, six falling under Serpu/a and one 
under Ditrypa. 
Levinsen ¢ (1883) includes twenty species in his Northern 
Polycheets, nine being Spirorbids, the rest being distributed 
over nine genera, of which Protula and Ditrypa had each 
two. 
In the great expedition of the ‘Challenger’ (1885) 
through the diverse waters of the world §, twenty-two 
Serpulids were encountered, the genera most in evidence 
being Protula (four), Serpula (five), and Placostegus (five), 
the three thus representing more than half the total number 
secured. It is interesting that not a single complete 
Spirorbis—-only two or three fragments of tubes—was 
obtained. In all probability, the haunt of the majority 
of the Spirorbids is the littoral region both of foreign 
seas and our own. 
The expedition of the U.S. Coast Survey Steamer 
‘Blake’ || (1887) in the rich waters of the Gulf of 
Mexico and the Caribbean Sea produced under the able 
hands of Ehlers (1887) only eleven species, but spread 
over nine genera—Spirobranchus having three species, the 
rest but one representative. 
Twenty-six species of Spirorbis are described by Caullery 
and Mesnil § (1897) in their important memoir on the genus, 
and collected from various parts of the world. 
Ehlers ** (1901) has thirteen, Serpulids in the collection of 
Polychets from the Straits of Magelilan and from Chili, 
of which eight are Spirorbids, the rest spread over four 
genera. 
In the careful account of the Serpulids from the Pacific 
* Annél, Chétop. Naples. 
+ Monat. Konig]. Akad. Wiss. Berlin. 
} Meddel. nat. Forh. Copenhagen, pp. 189 &e. 
§ ‘Challenger’ Reports, vol. xii. 
[le £8 Results of Dredging,’ &c., Mem. Museum Comp. Zool., Cam- 
bridge, U.S.A., vol. xxxi. 
qj “Bull. Ac, France et Belgique, t. xxx. p. 185, pls. vii.—x. 
** Polycheten Magell. u. Chilen, Straindes. 
