REPORT ON PHILIPPINE HYDROIDA 215 



Localities.— The holotype, Cat. No. 42177, U. S. N. M., was secured 

 at dredging station 5593, Sibuko Bay, Borneo and vicinity, Mount 

 Putri, 4° 2' 40" N., 118° 11' 20" E. ; depth, 38 fathoms. The speci- 

 men upon which the gonangium was found was from dredging sta- 

 tion 5428, Eastern Palawan and vicinity, 30th of June Island, 

 9° 13' N., 118° 51' 15" E.; depth, 1,105 fathoms. This is one of 

 the greatest depths at which specimens were secured on that cruise. 

 Other stations were 5641, Buton Strait, 4° 29' 24" S., 122° 52' 30" 

 E. ; depth, 39 fathoms; and 5255, Gulf of Davao, Dumalag Island, 

 7° 3' N., 125° 39' E.; depth, 100 fathoms. 



This species goes most reasonably into the genus Dictyocladium, 

 agreeing with it in having a four-flapped operculum in the absence 

 of an abcauline blind sack and in having the hydrothecae in more 

 than two rows. 



The appearance of three or four Irydrothecae in a whorl is rare 

 and may perhaps be regarded as an abnormality, but it appears the 

 normal arrangement. The specimen from Davao Bay found growing 

 on pearl oysters agrees with the form described above in the char- 

 acters of the stem, branches, and form of hydrothecae. It differs 

 in having the hydrothecae regularly in whorls of four, a char- 

 acter found in some of the branches .of the specimen already 

 described. At first when examining the specimen from Davao Bay 

 I was inclined to consider it the representative of a new genus, but 

 when the other specimens disclosed hydrothecae disposed in pairs, 

 in threes, and in fours, sometimes all on the same branch, the idea 

 of a generic distinction was abandoned, and it seemed best to place 

 it in the genus Dictyocladiwn. 



SERTULARELLA CORNUTA Stechow 



Plate 42, figs. 1, 2 



Sertularella cornuta Stechow, Neue Hydroiden der Deutschen Tiefsee- 

 Expedition, nebst Bemerkungeu iiber einige andere Formen, 1923, p. 12. 



Sertularella polyzonias, var. cornuta Ritchie, The Hydroids of the Indian 

 Museum, No. 1, 1910, p. 10. 



Trophosome. — Colony 5% cm. in height, pinnate in form, 4 cm. 

 spread from tip to tip. Main stem simple, slightly sinuous, divided 

 into regular internodes, each giving off a branch from near its proxi- 

 mal end and three hydrothecae, one opposite, one above, and one 

 below each branch. Branches alternate and projecting from the stem 

 at almost a right angle. They are quite straight, divided into irreg- 

 ular internodes, particularly near their distal ends, each internode 

 bearing from two to four hydrothecae. Hydrothecae rather closely 

 approximate, the top of one being opposite the base of the one next 

 above it. They are in the shape of a bent flask swollen proximally, 

 the distal one-third being free and bending outward from the branch. 



