. Bulletin of the Essex Institute. Essex Institute; Natural history; genealogy. 140 NEW INVERTEBRATA FROM Cabrilla occidentalis gen. et sp. nov. The body is irregularly globular, elongated, depressed above and of greenish-brown color. It is covered with light- green spots. The dorsal appen- dages are biserial, one on each side of a median line as in Tri- opa. These appendages are stumpy, slightly dendritic, bear- ing lens-like bodies at their tips. Four of these appendages are larger than the remaining and more laterally placed. The re- mainder are more dendritic and anterior. Two pairs of den
. Bulletin of the Essex Institute. Essex Institute; Natural history; genealogy. 140 NEW INVERTEBRATA FROM Cabrilla occidentalis gen. et sp. nov. The body is irregularly globular, elongated, depressed above and of greenish-brown color. It is covered with light- green spots. The dorsal appen- dages are biserial, one on each side of a median line as in Tri- opa. These appendages are stumpy, slightly dendritic, bear- ing lens-like bodies at their tips. Four of these appendages are larger than the remaining and more laterally placed. The re- mainder are more dendritic and anterior. Two pairs of dendritic appendages are found behind the branchiae. There are two dorsal tentacles, one on each side of the medial line. These appendages are conical, linear or sub- clavate and brown at their tips, which can be readily re- tracted. The branchiae are stellate, bipinnate, consisting of primary arms and lateral branches, of white color, transparent. These branchial plumes are situated near the posterior end of the body. Foot disk-like, and of a brownish-green color. The body is four inches in length. Cabrilla resembles Triopa of Johnston, but is most closely allied to Plocomorphorus of Ktippel. The lateral appendages are slightly dendritic, as in Den- dronotus, but unlike this genus there are branchial plumes. Triopa has but three branchial plumes and is smaller than Cabrilla. Plocomorphorus has a cloakless, slug-like body, with expanded cephalic veil and lateral appendages, plu- mose branchiae and two retractile tentacles. Cabrilla dif-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Essex Institute. 1n. Salem, Mass. , Essex Institute
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