ANTHOZOA OF THE WOODS HOLE REGION. 
235 
SAGARTIlDi® Gosse, 1858. 
Body with strong oral sphincter and numerous highly contractile tentacles. Mesenteries of two 
sorts; principal series in six pairs attached to oesophagus, and devoid of gonads; second series incom- 
plete, and bearing gonads in breeding season. Acontia present and protrusible through cinclides or 
directly through the tissues. 
BOLOCERID.E McMurrich, 1893. 
Sphincter more or less diffuse and weak; mesenteries devoid of acontia; pedal disk well devel- 
oped; tentacles stout, nonretractile, strongly constricted at base, hence often deciduous. 
BUNODID^ Gosse, 1858. 
Sphincter entodermal, “body usually studded with numerous tubercles, which are disposed in 
longitudinal rows, and may serve as suckers by means of which they have the faculty of adhering with 
force to foreign bodies. ” (Gosse.) Mesenteries often numerous and perfect but devoid of acontia. 
PARACTID.® Hertwig, 1882. 
Sphincter mesogleal, strong; body usually devoid of tuberculation, but with numerous longitudinal 
flutings; mesenteries numerous and perfect; no acontia. 
TEALllD^ Hertwig, 1882. 
“Hexactinia with numerous perfect mesenteries; sphincter strong, entodermal, projecting as a 
thick swelling into gastric cavity. ” 
“The most important feature of the family is, I consider, the extremely characteristic circular 
muscle, which can be recognized with the naked eye, as a thick swelling on the inner side of the wall. 
In transverse section it shows a circular or oval figure, fastened on one side to the wall; it is formed by 
the extremely strong pleating of the entodermal circular muscle layer. The large number of perfeet 
septa is also important; on the other hand, I have entirely disregarded the nature of the surface of the 
body, so that forms both with smooth and warty wall may find their place in the family.” (Hertwig, 
op. cit., p. 35.) 
Diagnostic Synopsis op Families of Hexactini.® (modified from Hertwig).® 
A. Tentacles forming simple wreath. 
a. Digitate. 
b. Pedal disk absent. 
, , , , , • , /Without conchula iLYANTmn.®. 
c. Si phonoglyphs and sphincter obscure/ „ 
^ “ With conehula Siphon actinidj®. 
bb. Pedal disk present. 
, , ^ t ^ j 1 t • f Absent .. SagarThd,®. 
a. Acontia present, sphincter mesodermal, cuticularcovering|p^^^^^^ Phellhd^ 
f Absent AntheomorphhDvE. 
( Weak AcTiNnD.,^. 
Strong entodermal Bunodid.E. 
Strong mesodermal Paractid.®. 
Mesodermal, transverse axis 
elongated AMpmANTmD,E. 
aa. Tentacles abnormal in shape. 
e. Clavate, knobbed Hbteractid^E. 
ee. Replaced by stomidia LiPONEMrD.E. 
/ SARCOPmANXmDAj. 
iTHALASSIANTmD.,®. 
B. Tentacles form double or multiple weaths CoRALLiMORPmD.®. 
eee. Branching or bushy . 
®Cf. Challens'cr Report, vol. xxvi, pt. 73, p. 7. 
