22 IOWA STUDIES IN NATURAL HISTORY 
Family Serpulide 
Protis Ehlers 
Protis sombrervana McIntosh 
Serpula sombreriana McIntosh, (1885), p. 515, pl. XX XTa, figs. 14 and 15. 
A single specimen in its tube was collected at Dredging Sta- 
tion 1. One gill is lost but in the general structure of the body, 
the form of the collar, and the thoracic sete, it agrees exactly 
with McIntosh’s deseription. The thoracic uncini are, how- 
ever, quite different from those figured by McIntosh for instead 
of having a row of small teeth they have but four increasing in 
size from the apex to the basal one which is very large. 
I have provisionally identified this as Protis, for it lacks an 
operculum and is therefore not Serpula. I was, however, un- 
able to find any collar sete like those described by Ehlers as 
characteristic of this genus (Ehlers 1887, plate 56, figure 11) 
though forms like Ehlers’ figure 12 are present. 
SPIROBRANCHUS Blainville 
Spirobranchus tricornis Morch 
Spirobranchus tricornis Mérch, quoted from Ehlers, (1887), p. 292, pl. 
57, fies: 8 to Lo. 
Spirobranchus giganteus Pallas 
Spirobranchus giganteus Pallas, (1766), p. 139. 
Ehlers, (1887), pp. 286 to 292, pl. 57, figs. 1 to 7. 
Three specimens taken at English Harbor, Antigua. 
PoMATostTEGuS Schmarda 
Pomatostegus stellatus Abildgard 
Terebella stellata Abildgaard, (1789), p. 142. 
Ehlers, (1887), p. 296. 
Ehlers deseribes this species but gives no figures. He gives 
the measurements of his specimen as 24 mm. in length. One of 
the Barbados individuals is 90 mm. long with a thoracie width 
of 6 mm. Thirteen specimens were collected in tubes ‘‘growing 
in Millepores.’’ No other locality was named. 
BIBLIOGRAPHY 
Abildgaard, P. E.—Beschreibung zweien Arten des Steinborers. Schriften 
der Ges. Naturf. Freunde zu Berlin. Bd. 9 (1789). 
Chamberlin, R. V.—The Annelida Polycheta. Memoirs Museum Comp. 
Zoology, XLVIII, pp. 1-514, pls. I-LXXX; Report on US.F.CS. 
‘« Albatross’? Expeditions to West Coasts Mexico, Central and South 
America, Galapagos Islands, 1891, No. XXXVIII: Tropical Pacific 
